1 cup all-purpose flour
4 cup water
Food coloring

Combine flour and 1 cup water into a large saucepan.  Stir in water until smooth.  Add the remaining 3 cups water and place over medium heat.  Bring the mixture to a sustained boil (cannot be stirred down) for 1 minute then remove from heat.  Let cool.  Pour into 3 or 4 separate cups (paper cups, plastic bowls, etc.) And add food coloring.

Store the paint in a air-tight plastic bowl, cup, or large baggie.