Lay an old shoebox on its side so that you can see into it. The shoebox should not have a lid on it. If your shoebox has an attached lid, you will need to cut it off.

Paint the inside ceiling and sides of the shoebox with blue-colored paints. This is your ocean background.

Color the bottom of the inside of the shoebox with a sandy-colored paint. Scatter a light layer of sand across the wet paint for a more realistic ocean bottom. Set the shoebox aside until the paint drys. The sand will then be stuck to the paint.

Wrap string around a few plastic sharks, and hang them inside the shoebox. Just tape the top of the string to the ceiling inside the shoebox. This gives the sharks the appearance that they are swimming.

Glue or hang additional plastic ocean animals within the shoebox. Crabs, fish, seahorses, clams, squid, seals and sea urchins are all animals you could include in your shark habitat. In fact, many of these are necessary to show where the sharks get their food.

Cut ocean plants out of construction paper and glue them around the sides of your ocean diorama, and to your ocean floor. Coral, seaweed, sea cactus, ocean lily and algae are all plants you should include in your shark habitat.

Cover the front of the shark diorama with a sheet of blue plastic wrap. This is optional, but will give the illusion that you are looking through the water at the shark and its habitat.