50 Under the Sea Birthday Party Ideas

Planning an underwater-themed celebration involves balancing soft textures with vibrant oceanic colors to create a cohesive environment.

These ideas cover everything from DIY decor to interactive stations that keep guests engaged while maintaining a high-end aesthetic.

Statement Dessert Tables & Backdrops

1. Layered Pastel Backdrop Displays

Credit: @peekaboo.ver / Instagram

Build a multi-dimensional focal point by staggering arched and rectangular panels in varying heights to fill a large venue space.

This wide layout provides a full scene that serves as both a dessert table background and a photo op area, filling the visual space effectively.

Construct the panels from lightweight foam core or thin plywood painted in matte pastel shades to prevent glare in photographs.

Credit: @peekaboo.ver / Instagram

Center the display with a personalized panel featuring the child’s name and age in a contrasting metallic finish for clear identification.

Placing the most recognizable characters near the center helps ground the theme and ensures the birthday child’s details are the primary focus.

Apply vinyl decals or laser-cut acrylic lettering to the center panel for a clean look that is easy to assemble on-site.

2. Iridescent Shimmer Wall Backdrops

Credit: @thepartyloft.events / Instagram

Create a high-impact focal point using an iridescent shimmer wall as the foundation for the main display area.

The reflective squares mimic the way sunlight hits the water, providing a sense of movement and depth behind the dessert table. Framing the wall with an asymmetrical balloon garland in seafoam green, lavender, and coral keeps the aesthetic whimsical and bright.

Secure the shimmer panels to a sturdy backdrop stand and use clear zip ties to connect them; this setup is reusable for different themes by simply changing the balloon colors.

Credit: @thepartyloft.events / Instagram

Incorporate specific oceanic motifs like oversized mermaid tails and pearl strands to define the theme clearly.

Adding a ‘pearl’ string made of small, uniformly inflated white balloons provides a delicate texture that contrasts with the larger matte balloons. The mermaid tail cutout serves as a secondary focal point that ties the color palette together.

When creating the pearl strand, under-inflate 5-inch balloons to keep them perfectly round and string them tightly together using a needle and fishing line.

3. Textured Ocean Wave Cakes

Credit: @table.matters / Instagram

Decorate a tiered cake with intricate white ruffles and pastel-colored chocolate molds of mermaid tails, shells, and coral.

The white-on-white piping creates a sophisticated texture that mimics ocean waves while allowing the colorful sea life accents to pop.

Place the cake on a clear acrylic plinth to maintain a light, airy feel and keep the focus entirely on the dessert’s details.

4. Oversized Mermaid Tail Backdrop

Credit: @nc.moments_ / Instagram

Create a focal point using a balloon sculpture shaped like a mermaid tail.

Positioning this at the end of a long dining table or behind a main display creates a sense of scale and depth.

Use a mix of matte and pearl-finish balloons in varying sizes to enhance the underwater effect and add texture.

5. Dimensional Sea Life Scenery

Credit: @audrey.k_events / Instagram

Create depth by layering multiple arched panels in varying shades of seafoam and dusty blue. Large-scale cutouts of friendly marine life, like narwhals and dolphins, can be attached directly to the panels to break up the flat surfaces.

The mix of matte balloons and wooden props creates a sophisticated but child-friendly environment without needing licensed characters.

Use Command strips to secure lightweight foam board cutouts to the backdrop panels for easy removal and repositioning.

Credit: @audrey.k_events / Instagram

Focus on the central cake placement by using a tall pedestal that sits higher than the surrounding treats. Symmetry is maintained by placing smaller floral arrangements and accent pieces on either side of the main display.

Elevating the cake ensures it remains the focal point even when the table is crowded with cookies and snacks.

Group smaller items like cookies on flat trays to keep the tabletop looking organized rather than cluttered.

6. Iridescent Shell Focal Points

Credit: @hannauneh / Instagram

Create a multi-dimensional photo area using an oversized inflatable shell as a central seat for the guest of honor.

The pearlescent finish of the shell reflects ambient light, while the surrounding balloon clusters mimic rising bubbles to ground the theme.

Position the shell slightly forward from the main backdrop to allow guests to sit for photos without blocking the cake display.

7. Multi-Layered Poolside Backdrop Installations

Credit: @deidrejsamuel / Instagram

Combine oversized shell and mermaid tail cutouts with organic balloon clusters to create a high-impact photo area.

Using different heights and textures like shimmer walls and matte panels adds depth without needing licensed characters.

Secure large foam or wood backdrops with sandbags when setting up outdoors near water to prevent tipping in the wind.

8. Jellyfish and Shell Backdrops

Credit: @alysseavrill / Instagram

Construct a multi-dimensional display using organic balloon garlands in seafoam and lavender to represent underwater formations.

Integrating paper lanterns with hanging ribbons creates the appearance of jellyfish floating within the backdrop.

Use varying balloon sizes and iridescent foil accents to add depth and catch the light during outdoor events.

Credit: @alysseavrill / Instagram

Position an inflatable shell seat near the main display to serve as a functional photo prop.

This setup allows for group photos without needing a complex chair arrangement, fitting the ethereal aesthetic.

Place the inflatable on a rug or flat surface to prevent punctures and ensure a stable seat for young children.

Under-the-Sea Tablescapes

9. Bubble-Themed Floor Seating Arrangements

Credit: @indie_bee_balloons / Instagram

Create a floor-level dining experience using shell-shaped cushions and clear iridescent balloons to mimic rising sea bubbles.

Low seating is approachable for toddlers and elementary-aged children while the clear balloons add vertical interest without blocking sightlines.

Use clear plastic bubble balloons of varying sizes and secure them to the wall or ceiling with fishing line to create a weightless effect. For the floor, mix teal and lavender velvet shell pillows to provide comfortable, themed seating.

Credit: @indie_bee_balloons / Instagram

Enhance the table centerpiece with a textured floral runner and individual shell-shaped plates containing pearl bead strands for a tactile experience.

The contrast between the soft purple baby’s breath and the hard ceramic shells creates a sophisticated underwater texture.

Place a strand of faux pearls inside each shell plate as a decorative element that guests can later wear or take home. To simplify the centerpiece, use a lavender tulle runner bunched up to create a similar wave-like volume at a lower cost.

10. Iridescent Ocean Place Settings

Credit: @table.matters / Instagram

Layer iridescent shell-shaped paper plates over larger scalloped chargers to create a textured and shimmering table arrangement.

The mix of seafoam green and soft pink tones prevents the table from looking monochromatic while sticking to the aquatic theme.

Pair the paper goods with fresh floral centerpieces in peach and lavender to balance the whimsical elements with sophisticated decor.

11. Lavender Reef Table Arrangements

Credit: @sassydassi / Instagram

Set a long table with a ridged lavender tablecloth to mimic the ripples of sand on the ocean floor.

The monochromatic base allows white scalloped plates and iridescent cups to stand out while maintaining a calm, ethereal atmosphere.

Use pearl-handled utensils and scattered sea glass or shells along the center to fill gaps between larger decor pieces.

Credit: @sassydassi / Instagram

Focus on sculptural centerpieces by placing textured florals inside large white shell-shaped vessels.

Using flowers like allium and sea holly creates an organic, reef-like appearance that feels sophisticated yet playful.

Secure the shell vases with a small amount of museum wax to prevent tipping if the party is outdoors or features active children.

12. Airy Pastel Seating Layouts

Credit: @hannauneh / Instagram

Arrange round tables with open-weave chairs to maintain a light and breezy atmosphere in a large indoor space.

The gaps in the chair backs prevent the room from feeling crowded, even with multiple seating clusters for different age groups.

Mix soft lavender, white, and coral chairs to define different seating zones while staying within the soft pastel palette.

Credit: @hannauneh / Instagram

Incorporate small wooden treasure chests into floral centerpieces to add height and thematic interest to the guest tables.

The rustic wood provides a natural contrast to the soft petals and adds a tactile element for guests to explore at their seats.

Place a single large shell inside an open chest to create a simple, low-cost focal point that does not obstruct conversation.

13. Driftwood Name Card Holders

Use natural elements to ground the bright colors of the table setting for a balanced look.

Wood adds texture and a shoreline feel that complements the watery blues and teals of the linens.

Look for driftwood at craft stores or collect it from a beach, ensuring it is cleaned and dried before use.

14. Organic Wave Table Layouts

Credit: @hannauneh / Instagram

Arrange seating using furniture with curved edges to mimic the natural movement of water.

Soft edges and pastel tones like seafoam and blush pink provide a sophisticated take on the theme while remaining playful for children.

Use rattan or woven chairs to introduce sandy textures that contrast with smooth, painted table surfaces.

Credit: @hannauneh / Instagram

Place small treasure chests filled with pearls as interactive centerpiece elements.

These miniature vignettes add a sense of discovery to the dining area and double as a thematic focal point for each guest.

Use white-painted wooden boxes and faux pearl strands to maintain a bright, clean aesthetic that aligns with a pearl-and-shell color palette.

15. Customized Marine Dining Stations

Credit: @nunza_kiddies / Instagram

Integrate the child’s name and age into paper plates and water bottle labels to create a custom dining experience at every seat.

Repeating a specific color palette across flowers and tableware helps define the party space without needing expensive rentals.

Use adhesive vinyl or cardstock wraps to upgrade standard party supplies into themed elements that match the overall aesthetic.

Credit: @nunza_kiddies / Instagram

Incorporate real sea shells as table scatter to provide organic texture among the paper goods.

Natural elements ground the whimsical pastel color palette and provide a more authentic underwater feel.

Place larger shells near centerpieces and smaller ones around individual place settings to create visual variety and depth.

Immersive Entrance & Atmosphere Decor

16. Custom Outdoor Welcome Signage

Credit: @nc.moments_ / Instagram

Use a large-scale mermaid tail cutout to mark the party entrance.

It establishes the theme immediately and serves as a landmark for arriving guests while providing a photo backdrop.

Secure the structure with a sturdy base or sandbags to handle outdoor conditions and prevent tipping.

17. DIY Jellyfish Lantern Canopy

Hanging lanterns add height and a sense of being underwater for guests as they move through the room.

Using varied lengths of ribbon creates a floating effect that mimics the natural movement of the ocean.

Secure these to the ceiling with removable adhesive hooks to avoid damage while ensuring they stay aloft throughout the event.

18. Whimsical Pastel Welcome Nooks

Credit: @zebraprintevents / Instagram

Create a multi-dimensional photo zone using foam board cutouts and varied balloon textures to greet guests upon arrival.

Combining matte pastel balloons with clear iridescent spheres mimics the look of rising bubbles, while paper lantern jellyfish add vertical interest and movement.

Anchor the display with a lightweight metal frame and use fishing line to suspend lanterns; this allows the setup to be moved easily if the party shifts from indoors to outdoors.

19. Staircase Mermaid Tail Garlands

Credit: @sh3rmss / Instagram

Guide guests through the home with organic balloon flows.

Pastel shades and clear bubble balloons create a soft, underwater transition.

Attach a large foil fin balloon at the top to signal the theme immediately.

20. Floating Bubble Ceiling Accents

Credit: @my1styears / Instagram

Transform a standard ceiling into an oceanic canopy by securing balloons in bubble clusters of teal, aqua, and pearl white.

This technique creates an immersive environment without taking up valuable floor space, making it ideal for home-based parties.

Use clear fishing line and varying balloon sizes to mimic the organic look of bubbles rising through water.

Credit: @my1styears / Instagram

Extend the theme to every corner of the room by layering photo garlands on mantels and using wall-mounted maps or bunting to fill large empty spaces.

Spreading decor across existing furniture like fireplaces and sideboards ensures the theme is visible from every angle of the party area.

Balance high-impact areas like the ceiling with smaller details at eye level, such as plush octopuses or photo strings, to keep children engaged.

21. Vertical Streamer Seascape Nooks

Credit: @orientaltrading / Instagram

Designate a corner of the room as a photo-ready backdrop by layering vertical crepe paper and hanging paper lanterns to mimic an underwater scene.

Using varied heights—from ground-level twisted paper seaweed to ceiling-hung jellyfish—creates a sense of depth that makes the space feel immersive for guests.

Incorporate an inflatable shell-shaped pool float as a lightweight, budget-friendly seating option that reinforces the theme without requiring heavy furniture.

22. Crepe Paper Kelp Forest

Credit: @hobbylobby / Instagram

Create an immersive transition by lining entryways with vertical crepe paper to mimic a kelp forest.

This budget-friendly approach uses height to envelop guests in the theme without taking up floor space in high-traffic areas.

Twist teal and seafoam streamers before taping them to the baseboards, and hang paper lanterns with ribbon tentacles from the ceiling to complete the vertical effect.

23. Seaweed Streamer Photo Booth

Create a simple, high-impact backdrop for guest photos using basic party supplies.

Crepe paper is inexpensive and provides significant color and texture with very little effort.

Twist the streamers as you hang them to create a wavy, organic look that mimics underwater plants.

Oceanic Treats & Themed Food

24. Oceanic Treats on Edible Sand

Credit: @botanico.co.sg / Instagram

Assemble oyster macarons by placing a single sugar pearl inside the filling of a pink macaron shell.

This transformation uses standard bakery items to create a high-impact, themed treat without requiring complex baking skills.

Use a stiff buttercream or ganache to hold the pearl in place and keep the top shell propped open at an angle.

Credit: @botanico.co.sg / Instagram

Line serving trays with crushed biscuits to act as edible sand, providing a stable and thematic base for cake pops.

The texture of the crushed cookies prevents round treats from rolling and adds a realistic ocean floor element to the presentation.

Pulse vanilla wafers or graham crackers in a food processor until they reach a fine, sandy consistency for the most realistic look.

25. Coral Reef Veggie Platter

Transform a standard vegetable tray into a vibrant underwater scene using vertical shapes.

Vertical arrangements make the food look more like a natural reef and encourage kids to reach for healthy snacks.

Use a thick hummus or ranch dip in the center to help anchor the pepper strips so they stay upright.

26. Produce and Sandwich Platters

Credit: @sh3rmss / Instagram

Group fruits by color to represent coral and sea life.

Themed labels like Mermaid Fruit turn standard snacks into part of the story.

Use croissant sandwiches as crab shapes by adding small olive eyes on toothpicks.

27. Vibrant Coral Reef Fruit Platters

Credit: @sh3rmss / Instagram

Organize fresh fruit by color to create a visually striking reef effect on a serving tray.

High-contrast colors like deep red berries and bright green grapes mimic the biodiversity of the ocean floor without needing complex food styling.

Pair the fruit with seaweed candy skewers made from wavy sour belts threaded onto wooden sticks for a mix of healthy and sweet options.

28. Bubble-Enhanced Outdoor Snack Carts

Credit: @hannauneh / Instagram

Set up a dedicated snack station with themed decals and a bubble machine to engage guests in an outdoor environment.

The bubbles catch the sunlight and provide a constant sense of movement, making a simple white cart feel like part of a reef.

Apply vinyl mermaid tail decals to a standard white cart for a temporary, budget-friendly thematic upgrade.

29. Sea Glass Rock Candy

Serve candy that mimics the look of frosted glass found on the beach.

The translucent colors fit the aesthetic and look sophisticated when displayed in glass jars.

Label the jars clearly so guests know these are edible treats and not part of the table decor.

30. Gradient Coral Reef Cakes

Credit: @nunza_kiddies / Instagram

Apply a watercolor frosting technique in teal and pink to represent the movement of the ocean’s surface.

Adding edible sand made from crushed biscuits around the base provides a realistic beach texture that anchors the design.

Use pre-made silicone molds for fondant shells and tails to achieve professional-looking details with less effort.

Credit: @nunza_kiddies / Instagram

Place the focal cake on a tall, fluted pedestal to elevate it above the rest of the dessert spread.

Increasing the height of the cake ensures it remains visible even when the table is crowded with guests or other treats.

Position the pedestal toward the center of the backdrop to create a balanced, symmetrical photo opportunity.

31. Mermaid Tail Cupcake Liners

Elevate standard cupcakes with themed paper accessories rather than expensive custom toppers.

This is a cost-effective way to make grocery-store cupcakes look custom-made for the theme.

Place the baked cupcakes into these decorative liners just before serving to keep the paper crisp.

Aquatic Activities & Games

32. Soft Play Aquatic Zones

Credit: @a.favourforyou / Instagram

Designate a safe activity area for younger guests using neutral soft play equipment that acts as a foundation for themed accents.

All-white foam blocks and mats provide a clean, bright aesthetic that resembles sea foam while allowing specific ocean decals to stand out.

Arrange the play zone on a flat grass surface or patio, using interlocking foam mats to create a defined boundary and a cushioned landing for active toddlers.

Credit: @a.favourforyou / Instagram

Incorporate a ball pit filled with a palette of pearl, lavender, and soft pink to represent bubbles on the ocean floor.

The color coordination reinforces the theme without being overwhelming, while shell-shaped plushies offer a tactile, thematic element for sensory exploration.

Limit the ball pit colors to three or four shades to maintain a sophisticated look, and ensure the pit is deep enough to contain the balls during play.

33. Ocean-Floor Sensory Sand Station

Provide a tactile play area that keeps younger guests focused and entertained in a controlled space.

Sensory bins are self-contained and allow for open-ended play without needing constant adult instruction.

Place a large drop cloth or an outdoor rug underneath the bin to catch any stray sand for easy cleanup later.

34. Creative Workshop Activity Zones

Credit: @nc.moments_ / Instagram

Set up a dedicated painting area with pre-sketched canvases of sea life.

This offers a structured activity that allows children to focus on their own art piece while staying engaged with the theme.

Pre-fill small paint pots to prevent large spills and use disposable table covers for easy cleanup after the activity.

Credit: @nc.moments_ / Instagram

Organize a jewelry-making station where guests can string beads and charms into necklaces.

A mannequin head with colorful hair can display themed headbands or finished pieces, adding a playful element to the setup.

Include elastic cord to make the assembly process easier for small hands and use clear organizers to keep bead types separated.

35. Pearl Necklace Beading Station

A craft station that produces a wearable souvenir for the guests to take home.

Beading helps with fine motor skills and provides a quiet, focused activity during high-energy moments.

Use pre-cut elastic cords with one end already knotted to prevent beads from sliding off while children work.

36. Giant Bubble Wand Station

Create an outdoor activity that fills the air with large, shimmering bubbles.

Large bubbles are visually impressive and provide excellent photo opportunities throughout the celebration.

Make your own bubble solution using dish soap and guar gum for extra-strong bubbles that last longer.

37. Interactive Storytelling Nooks

Credit: @hobbylobby / Instagram

Designate a specific corner for group interactions using themed inflatable furniture and vertical paper streamers to mimic an underwater grotto.

An inflatable clam shell serves as a visual focal point and comfortable seating for a host or character, while vertical ruffles provide texture and depth without high costs.

Hang crepe paper streamers in varying shades of seafoam and mint from the ceiling to simulate kelp forests; use removable adhesive hooks to protect paint and window frames.

38. Mermaid Piñata Game

Credit: @hobbylobby / Instagram

Use a large-scale character piñata to serve as both a decorative element and a primary source of entertainment for younger guests.

The metallic texture of the tail adds a shimmering, aquatic feel to the space, while the activity itself keeps children engaged and provides a clear climax to the party schedule.

For a DIY version, use large green sequins or metallic foil paper to create a scale effect on the tail, and ensure the hanging point is reinforced to handle the weight of the candy.

39. Ocean Coloring Tablecloth

Provide a low-mess activity that keeps children occupied while they wait for food.

It covers the table while serving as an interactive canvas for multiple children at once.

Use washable crayons or colored pencils rather than markers to prevent ink from soaking through to the table.

Party Favors & Take-Home Gifts

40. Interactive Favor Display Walls

Credit: @pretty_the_party / Instagram

Organize party favors on a custom shelving unit to create a structured and decorative farewell station for guests.

Utilizing vertical space keeps the floor clear and allows for large-scale decorative elements like balloon clusters and oversized cutouts to frame the gifts.

Swap expensive custom acrylic shelves for simple wooden slats painted to match the board, and use small adhesive labels to personalize each shell-shaped bag for the children.

Credit: @deidrejsamuel / Instagram

Utilize a large arched shelving unit as a dedicated station for take-home gifts, organized by color or item type.

It turns the party favors into a secondary backdrop, filling vertical space and keeping the floor area clear for guest movement.

Line baskets with colored tissue paper that matches the palette to hide contents and add pops of lavender and aqua.

41. Shell-Shaped Glycerin Soaps

Offer a practical gift that doubles as a decorative accessory for guests to use at home.

These are visually appealing and serve a purpose long after the party ends, unlike many small plastic toys.

Add a drop of ocean-scented essential oil to the melt-and-pour soap base to enhance the sensory experience.

42. Organized Favor Nook Shelving

Credit: @nunza_kiddies / Instagram

Utilize open, arched shelving units to display party favors as an integrated part of the event decor.

Neatly arranged gable boxes create a repetitive, polished pattern that looks intentional rather than cluttered.

Label each box clearly if they contain age-specific items so parents can easily grab the correct gift at the end of the party.

43. Ocean Slime Jars

A popular, trendy favor that children can continue to play with after the event.

Glitter and small charms make the slime look like a piece of the ocean captured in a jar.

Use airtight containers to ensure the slime stays pliable and does not dry out before the guests get home.

DIY Crafts & Small Details

44. Message in a Bottle Invitations

Use creative mailers to build excitement and set the tone before the party begins.

Physical props make the event feel like a special discovery for the children and their parents.

If mailing these, use plastic bottles instead of glass to ensure they arrive safely and reduce shipping costs.

45. Watercolor Sea Creature Masks

Let guests create their own costumes with a simple painting activity during the party.

Watercolor paints dry quickly, allowing children to wear their creations almost immediately after painting.

Pre-cut the eye holes and punch the side holes before the party to save time and keep the activity safe.

46. Glittered Starfish Wands

Simple props that encourage imaginative play and work well for group photos.

These are easy to assemble and add a touch of sparkle to the overall party atmosphere.

Use a hot glue gun to attach the starfish and ribbons to the dowels for a secure hold during play.

47. Starfish Treat Holders

Credit: @pinkpeonyrentals / Instagram

Create custom treat holders by using a craft cutting machine to produce starfish shapes from teal cardstock.

This is a budget-friendly way to theme standard snacks without purchasing expensive pre-made containers.

Fold the legs of the paper starfish slightly upward to cradle small candies or truffles securely.

48. Personalized Milestone Sea Displays

Credit: @my1styears / Instagram

Integrate personal milestones into the decor by using a wooden photo board and custom embroidered crowns that double as party accessories and long-term keepsakes.

These elements add a sentimental layer to the event, allowing guests to view the child’s growth while maintaining the soft blue and sandy beige color scheme.

Use themed wrapping paper for gifts nearby to create a dedicated memory nook that serves as a secondary photo backdrop.

49. Layered Paper Table Accents

Credit: @smiley_eventos / Instagram

Create custom table vignettes using layered paper cutouts to add height and personalization to the display.

These 3D elements provide a whimsical focal point that complements the cake and floral arrangements without requiring heavy props.

Copy the use of foam spacers between paper layers to create a 3D effect. Swap expensive custom orders for DIY printables on heavy cardstock to stay within budget.

50. Themed Drink Bottle Tags

Credit: @nunza_kiddies / Instagram

Elevate standard beverage bottles with custom cardstock hangers that feature the guest of honor’s name and age.

Small details like personalized tags and dome-lidded treat containers help reinforce the theme at every guest interaction.

Print tags on heavy cardstock or water-resistant paper to prevent them from wilting if the drinks are served chilled.

Frequently Asked Questions

How do I make a room look like it’s underwater?
To create an immersive aquatic atmosphere, drape sheer fabrics like organza or tulle in shades of teal and aqua across the ceiling to simulate moving water. Incorporating iridescent streamers and clusters of clear balloons in varying sizes will mimic rising bubbles, while blue-toned lighting or projectors can add a shimmering, wavy effect to the walls.

What are some healthy under-the-sea themed snacks?
Healthy options can be both thematic and appealing. Try ‘crab’ sandwiches made from croissants with olive eyes on toothpicks, ‘octopus’ bell peppers served with hummus, or ‘seaweed’ skewers made from green grapes. Celery sticks filled with nut butter and topped with goldfish crackers also make for a quick and nutritious ‘sea’ snack.

How can I plan an ocean party on a budget?
Focus on high-impact DIY projects like paper plate jellyfish with ribbon tentacles or ‘coral’ structures created from spray-painted coffee filters. Utilizing affordable materials like fishnetting and seashells from craft stores can add texture to tablescapes, while a homemade backdrop of blue crepe paper streamers provides a professional look at a low cost.

What are good party favor ideas for an underwater theme?
Practical and thematic favors include reusable whale-shaped straws, small jars of blue kinetic ‘sea’ sand, or ocean-themed bath toys. For a creative touch, package items in translucent mesh bags or small ‘treasure’ chests to keep the aesthetic consistent with the ethereal, underwater theme.

How do I incorporate ‘bubbles’ into the decor without a mess?
Instead of using bubble machines that can create slippery floors, use physical decor to represent bubbles. Clear plastic ornaments hung at different heights, white balloons of various sizes clustered together, or iridescent window film applied to glass surfaces can create the visual effect of bubbles and shimmering water without any cleanup required.