O and I made paint for the sliding glass door a few days ago, and we finally found time to use it today! The idea and recipe for this activity came from this blog. To make the paint you need dishwashing soap, cornstarch, and food coloring. I poured about a tablespoon (maybe 2, I didn't measure it) of soap into each dish. Then O put a tablespoon of cornstarch in each bowl and mixed it around. She then added a few drops of food coloring to each bowl.