Cover the front side of your plate with glue.
Crumble, then uncrumple the blue tissue paper (it adds texture). Lay the tissue paper over the top of the plate, then push down gently starting from the middle so that it sticks.
Flip the plate over, and cut the tissue paper, leaving about 1/2" extending out from the plate.
Fold the extra tissue paper around the bottom of the plate, pushing it into the glue.
Flip the plate back over to the "ocean" side. Spread white glue over the bottom section where you'd like the sand to go. Sprinkle sand over the glue, press down so that it sticks, then shake off the excess.
Cut sponges into short, curved shapes (little crafters may need some help with this part). Glue to the plate so that they are half in the sand and half in the water.
Add some small seashells around the sponges.
For each fish you make, you'll need one big shell and three smaller ones. Paint the shells whatever colors you like best.
Glue one of the small shells to the top of the large shell, then add two underneath, making a top fin and a tail. Add a wiggly eye. Repeat to make several more fish.
Once the glue is dry on your fish, glue them to the paper plate. Dip the eraser end of a pencil into light blue paint to make bubbles.
Let the glue and paint dry, then your artwork is ready to show off to the world!