Homemade Bath Crayons from Little Crunchy Mama: Buy some glycerin soap at a craft store. Melt it in the microwave, add food coloring, and pour into an ice cube tray. Takes about an hour to cool completely, then pop out of the mold and you have crayons!
Washable Spray Chalk - cornstarch and baking soda and food coloring . what a fun way for kids to make art this Summer! Making the chalk takes seconds, and it easily washes off of the sidewalk and other outdoor surfaces