step-by-step diy underwater diorama craft using an egg carton, paint, sand, and paper decorations. creative ocean-themed

activity aquatic art artistic blue cardboard colorful coral craft creative decoration diorama diy ecofriendly educational environment fish fun handmade hobby kidfriendly kids learning marine nature ocean paint play project recycling sand school sea seaweed starfish stepbystep summer tutorial underwater upcycling workshop