Homemade Hennas! Quick and easy! :) Recipe: 1/4 cup corn starch 1/4 cup water 2 packets orange Kool-Aid 4-6 drops of green food coloring ... Whisk corn starch and water together, then add Kool-Aid and food coloring. If needed, add more corn starch to thicken. Paint on the design and let harden, once dry the paste will crack off leaving the color behind. Enjoy!