15 Ideas for DIY Under the Sea Decorations

Last updated on January 14, 2025

Discover creative and fun ideas to transform your space into an enchanting under-the-sea paradise with unique DIY decorations.

Have you ever wanted to transform your home into an enchanting underwater paradise, mermaids and sea creatures included, but without getting wet? Grab your snorkels—let’s dive into a sea of unique and fun DIY decorations that won’t leave you fishy-smelling.

Whether it’s for a party that would make Poseidon proud or just a whim to bring the ocean to your living room without inviting a couple of seagulls, I’ve got ideas so creative that even Sebastian would want to come take a look. Get ready to make waves! 🌊

Seashell Garland

Create a whimsical touch by draping colorful seashells to add a beachy vibe. This decorative piece complements any under-the-sea theme, drawing attention with its natural beauty. Perfect for parties or everyday décor, it brings a bit of ocean magic indoors.

Jellyfish Lanterns

These whimsical lanterns offer a soft, glowing ambiance that mimics the enchanting underwater world. Using simple materials, they create an eye-catching decoration that dances with light. Hang them at varying heights for a mesmerizing, jellyfish-like display.

Coral Reef Cake Stand

This colorful cake stand mimics the vibrant textures and shapes of a coral reef. With layers of creativity, it adds a whimsical touch to any dessert display. Perfect for beach-themed parties, it elevates treats while bringing the ocean’s beauty indoors.

Fishnet Wall Hangings

This decorative piece captures the essence of the ocean with its textured appearance. It can hold shells, starfish, or even fairy lights for added sparkle. Hang it on a wall to instantly transform your space into an underwater oasis.

Bubble Wrap Seaweed

Transform plain old bubble wrap into a vibrant underwater scene. By cutting and shaping it, you can mimic the fluidity and movement of seaweed swaying in the ocean currents. This whimsical touch adds texture and an eye-catching element to your decorations.

Starfish Place Cards

These charming place cards add a whimsical touch to your under-the-sea theme. Simply attach a starfish to a card with each guest’s name for an oceanic flair. They work beautifully for beach parties, showers, or any aquatic gathering.

Bottle Cork Octopus

This quirky decoration features adorable octopus figures crafted from wine corks. With their multiple tentacles, they add a whimsical touch to your undersea theme. Perfect for tabletops or as part of a fun aquatic centerpiece, they’re sure to evoke smiles.

Sand Dollar Coasters

These elegant coasters mimic the look of sand dollars, bringing a touch of beach magic to your table. Their unique design adds a natural element, perfect for summer gatherings or ocean-themed parties. Plus, they’ll protect your surfaces while keeping the sea vibes alive!

Driftwood Centerpiece

A driftwood centerpiece brings the rustic charm of the ocean right to your table. It mimics the natural beauty of the seaside with its weathered textures and organic shapes. Add shells or tealight candles for an enchanting under-the-sea vibe.

Tissue Paper Sea Fans

These colorful decorations mimic the delicate beauty of real sea fans, bringing a burst of oceanic charm to any space. They can be hung from the ceiling or displayed on a wall, adding depth and texture. Use various shades of blue, green, and purple to enhance the underwater theme and create a vibrant atmosphere.

Clam Shell Candle Holders

These charming holders provide a whimsical touch while softly illuminating any space. Perfect for beach-themed events, they evoke the ocean’s essence with their natural beauty. Imagine the flickering candlelight dancing through the shells, creating an enchanting atmosphere.

Paper Plate Portholes

Transform paper plates into whimsical portholes for a fun seaside vibe. They frame photographs or colorful ocean scenes, adding a touch of creativity to your decor. Hang them at varying heights to create a dynamic underwater effect.

Mason Jar Aquariums

These charming little creations bring a slice of underwater beauty to your decor. Filled with sand, faux plants, and colorful pebbles, they mimic a real aquarium without the upkeep. Perfect for tabletops or as a whimsical centerpiece, they add a touch of ocean magic to any space.

Felt Fish Mobile

This whimsical decoration features colorful felt fish hanging playfully from strings. It sways gently in the breeze, mimicking the movements of real fish underwater. Perfect for a beach theme or a playful space, it adds a fun and vibrant touch to any room.

Glass Pebble Bubbles

These colorful glass pebbles mimic shimmering bubbles, adding a playful touch to your underwater theme. Scatter them on tables, or place them in jars for a delightful visual effect. Their glossy surface reflects light beautifully, enhancing the aquatic atmosphere of your decorations.