A Splash of Salt
Dissolve salt in warm water. The solution should be super-saturated, add salt until no more will dissolve in the water and you see the salt floating at the bottom of your container. Have your child draw on a dark piece of construction paper with crayons. Then have your child brush the salt solution over the paper. The crayon will resist the salt water. Dry the painting flat. When the painting is completely dry, you can, as an optional step, spray the painting with Aquanet to hold the salt chunks in place. I am told the only hairspray that will work is Aquanet. Once dry, the salt solution will create a sparkly effect on the paper.