What you will need:
cornstarch, food coloring, water, tray or large lid to put paint on, painting tools or just your hands!
Mix together a couple tablespoons of cornstarch, a few drops of food coloring, and enough water to make your paint runny. Place on an large lid and have fun painting.
I took out fly swatters from an idea I found here, but they preferred just to use their hands. I would recommend changing your little ones into clothes that are okay getting dirty and possibly stained with the food coloring. Bath time was a must after this fun but messy activity.
This paint is liquid when you touch it but it can be picked up with your hands easily. When it dries it turns back into powder. The little ones had fun exploring with the consistency and getting all messy.