Assist your child in cutting a piece of blue construction paper to fit the bottom of your shoe box.
Use a glue stick to secure the paper in place.
Take green and blue tissue paper and rip it up, then crumple it into small pieces. Glue the pieces to the construction paper randomly using your glue stick.
Assist your child in cutting a piece of plastic food wrap to use over the top of the tissue paper. This does not have to be cut to an exact fit, as little wrinkles provide the illusion of ripples and waves.
Place small dabs of crafting glue along the perimeter of the construction paper.
Crinkle the plastic wrap slightly and then gently secure the plastic wrap to the bottom of the shoe box.
Proceed with adding other items to the diorama as assigned.