Stunning Under-The-Sea Decorating Ideas Kids Would Love (part II) #7. Make these cute paper lantern jellyfish. #8. Create bubble balloon strands for underwater theme decor. #9. Use some curly pool noodles, foam flowers and plastic table cloths to make this cute coral reef. #10. Transform backyard pool to a scene of under-the-sea. #11. Use spray foam to create these stunning coral reef. Share this post