To create a home that looks as if you just dove into the ocean, paint blue walls, add corals and oceanic fish, and display oceanic . If you don’t want all that aqua in your home, you should have a neutral wall and then add starfish decor to show off your oceanic, deep blue sea and create a magical under-the-sea place. Exhibiting oceanic life is an amazing way to create, design an underwater schemed interior and highlight the beauty of the deep blue sea.