To make a place that makes you feel as if you just went snorkeling, hang up a tapestry, add corals and deep sea fish, and display underwater . If you don’t want too much aqua in your home, you could have a neutral wall and then decorate with seashell decor to feature your underwater, deep blue sea and create a beautiful under-the-sea view. Featuring oceanic life is a perfect way to create, design an underwater themed interior and showcase the beauty of the deep blue sea.