Stunning Under-The-Sea Decorating Ideas Kids Would Love (part III) #12. Go for a door decoration inspired by jellyfish. #13. Paint a under-the-sea themed mural on the walls and ceiling. #14. Make this easy under-the-sea backdrop using plastic tablecloths. #15. Bring the feel of “under the sea” to party home by using blue cellophane to cover windows and adding underwater creatures. #16. Turn the entrance into a tunnel in form of “under the sea”. Share this post