Obtain bathtub grippers that are fish shaped. I found mine at the dollar store. (You can use any shapes.) Peel off the back, and let your child decorate with glitter, or construction paper. You don't have to use glue:)
a. Lava bottles: fill 1/2 water and food coloring, and 1/2 baby oil. It produces a lava lamp effect when tilted.
b. Snow globes: fill half with water and half with corn syrup. Add glitter, beads, paper clips etc. The corn syrup makes the glitter fall slowly for dazzling effects.