Painting with Watercolors, Glue and Salt. This will be a fun project this summer, just paint the canvas with watercolors. add some kosher sea salt (coarse is better than fine salt) and some glue splotches!
Make colored sand art by stirring a chalk stick in a bowl of salt. it changes the color. Stir less for light color and more for dark richer color. (I used to do this with salt and food coloring. but the chalk stick idea is brilliant!