17+ Under the Sea Decoration Ideas to Make Waves in Your Home 🌊
Creating an “under the sea” themed decor can transform any space into an enchanting, ocean-inspired haven.
From elegant beachy interiors to playful, mermaid-themed party setups, the possibilities are as vast as the sea itself!
Whether you’re planning a nursery, a party, or simply want to add a touch of coastal charm to your home, these “under the sea” decoration ideas bring the magic of the ocean right to your doorstep.
Dive into these 17+ inspiring decor ideas that will make waves in any room!
1. Elegant Ocean-Inspired Living Room
A luxurious living room with an under-the-sea theme.
Large wall art of a coral reef scene in deep blues and turquoise tones, with shimmering silver and pearl accents.
Ocean-colored throw pillows on a white sofa, a glass coffee table with seashells inside, and delicate seaweed-like plants around the room.
Ambient lighting casting a soft, underwater glow.
2. Mermaid-Themed Party Decor
A magical mermaid-themed party setup with iridescent balloon arches, pastel-colored shells, and shimmery tablecloths in shades of lavender, teal, and seafoam green.
Tables adorned with fishnet overlays, small glass jars filled with sand and shells, and centerpieces featuring coral and pearl accents.
Ocean-themed hanging decorations with seaweed and starfish cutouts.
3. Under the Sea Nursery
A cozy under-the-sea themed nursery with soft aqua and coral walls, a crib with a nautical blue-and-white striped bedding set.
A mural of friendly sea creatures like dolphins, turtles, and starfish on the wall.
Mobiles hanging above the crib with miniature whales, jellyfish, and seashells, and a plush blue rug mimicking ocean waves.
4. Ocean-Themed Bedroom for Kids
A vibrant ocean-themed kids bedroom with a mural of colorful fish, coral, and seaweed, a bed shaped like a pirate ship, glow-in-the-dark stars on the ceiling, a treasure chest for toy storage, and light fixtures that look like jellyfish.
5. Underwater-Themed Outdoor Party
An outdoor party with underwater decor, featuring a tented area with hanging blue and green streamers to look like water.
Tables set with aqua linens, seashell-shaped plates, and coral-inspired centerpieces.
LED string lights hung overhead mimicking bubbles, and inflatable sea creatures like dolphins and turtles floating in a nearby pool.
6. Ocean-Inspired Bathroom Decor
A serene bathroom inspired by the ocean, with teal mosaic tiles on the wall resembling scales, sandy beige floors, and shell-shaped soap dishes.
A large mirror framed with seashells and coral, towels in soft blue hues, and a shower curtain with a gentle underwater scene of fish and seaweed.
LED lights under the sink casting a soft blue glow, creating a tranquil underwater effect.
7. Beachy Dining Room Decor
A beach-inspired dining room with a driftwood table, blue linen napkins, seashell place settings, a centerpiece of white candles surrounded by coral and sea glass, a large ocean-themed mural with a view of gentle waves and seafoam, and hanging lights styled as bubbles or jellyfish.
8. Sophisticated Ocean-Themed Office
A sleek home office inspired by the ocean, with a large framed photo of a deep-sea reef on one wall, a glass desk with a sand-filled base featuring small shells, and deep blue walls accented with metallic silver decor.
An ocean-wave shaped shelf displaying nautical books and decor items like mini sailboats and shells.
9. Under the Sea Centerpieces
DIY centerpiece ideas for an ocean-themed event: glass bowls filled with sand, small starfish, and tealights floating on top.
Small glass vases filled with layers of blue-colored water beads to look like ocean waves, decorated with miniature fish and seaweed.
10. Ocean-Themed Christmas Decor
A Christmas tree decorated with an under-the-sea theme, with blue and teal ornaments, starfish, and seashells as ornaments.
Sea glass garlands wrapped around the tree, and soft white lights give a sparkling water effect.
Presents wrapped in aqua and sandy tones with starfish toppers, and a sand-filled base surrounding the tree with more shells and coral decor.
11. Ocean-Themed Wedding Setup
A romantic ocean-themed wedding setup on the beach, featuring white chairs adorned with seashell garlands and draped in soft blue fabric.
A wedding arch decorated with coral branches, starfish, and delicate blue flowers.
Pathway lined with sea glass and small candles to mimic ocean bubbles, with a clear view of the sea in the background.
12. Aquarium-Inspired Kitchen Decor
A modern kitchen inspired by an aquarium theme, with deep teal cabinetry, clear glass shelving to display seashells and small marine figurines, and a backsplash resembling sea glass tiles in shades of blue and green.
Hanging pendant lights styled as jellyfish, and a fish tank embedded into the kitchen island.
13. Under-the-Sea Playroom
An underwater-themed playroom with walls painted in vibrant coral reef scenes filled with playful fish, sea turtles, and dolphins.
Soft blue carpeting mimicking the ocean floor, plush sea creature toys like octopuses and starfish scattered around.
A ceiling mural with soft LED lights to resemble sunlight filtering through water.
14. Shell and Coral Fireplace Mantel Decor
A coastal-themed fireplace mantel decorated with a mix of shells, coral pieces, and small lanterns.
White and blue candles in glass holders resembling sea glass, and a mirror above framed with driftwood and shells.
Soft string lights wrapped around the coral accents to add a warm glow.
15. Beach-Themed Patio Decor
A beach-inspired patio setup with soft blue cushions on wicker furniture, a fire pit surrounded by sand and seashells, and a soft, woven rug resembling ocean waves.
String lights and hanging lanterns casting a warm glow, and small potted plants with sea grass and succulents adding greenery.
A bar cart decorated with tiny shells and driftwood.
16. Underwater-Themed Office for Kids
A playful underwater-themed study area for kids, with blue walls painted in an ombre effect to mimic the ocean depths.
Shelves shaped like sea creatures such as whales and turtles, a desk with fish-shaped knobs, and a cozy chair covered in soft, seaweed-green fabric.
Above, a lamp shaped like a fish, casting a gentle, underwater blue light.
17. Sea Glass and Driftwood Entryway
A serene entryway inspired by the sea, featuring a driftwood console table with a vase of sea grass and a glass bowl filled with sea glass.
A mirror framed with a mix of shells and small pieces of driftwood, and a large ocean-themed painting.
Soft blue and sandy-toned rugs on the floor, with ocean-scented candles for a beachy feel.
18. Coral Reef-Themed Outdoor Lounge
An outdoor lounge space with coral reef-inspired decor, featuring bright cushions in coral, turquoise, and sand colors.
A coffee table decorated with a shell and coral centerpiece, and surrounding plants in pots that look like sea urchins.
Hanging lanterns shaped like jellyfish and an underwater mural on one wall create a cozy, reef-like atmosphere.
19. Submarine-Themed Bedroom for Kids
A unique submarine-themed kids’ bedroom with round porthole-style windows, navy blue walls, and an underwater mural of sharks, jellyfish, and sea plants.
The bed has a headboard designed to look like a submarine control panel, and there are metallic accents throughout to give it a deep-sea exploration feel.
Soft blue and green bedding and a lamp shaped like a lighthouse add a nautical touch.
20. Seaside Vintage Living Room
A vintage-inspired living room with an under-the-sea theme, featuring distressed white and blue furniture, vintage maps of ocean currents framed on the wall, and antique diving equipment as decor.
A large woven rug in sandy tones, a driftwood coffee table, and seashells artfully arranged on side tables, with a subtle fishnet draped over one corner of the room.
Final Thoughts
“Under the sea” decor can transform any room or event, creating a mesmerizing atmosphere that reflects the beauty and mystery of the ocean.
With options for every style, from elegant ocean-inspired spaces to playful, mermaid-themed setups, these ideas offer an ocean of possibilities.
Whether you’re inspired by the vibrant colors of coral reefs or the calming hues of beachy blues, there’s a perfect decor idea here for you.
Let these ideas inspire your next decor project, bringing a touch of the sea’s magic and tranquility into your life. 🌊