Two ways to make finger paints:
Mix liquid starch, 1-2 tablespoons soap flakes, and food coloring in a bowl, whip with a beater. Fill small containers with mixture and add more food coloring to brighten.
Mix 3 tablespoons sugar, 1/2 cup cornstarch together and add 2 cups cold water. Cook over low heat, stirring constantly until well blended. Divide among four or five small cups, add drops of food coloring to color and a pinch of detergent to facilitate clean-up.