milk + food coloring + dishsoap + toothpick : The fun is in the mixing of colors, but kids can "paint" paper towels afterwards.
DIY Frosting Chart - Make any color frosting with store bought food coloring
Rosy-Cheeked Snowman - Kids can give a rosy glow to their frosty friends by mixing five drops of red food coloring with a cup of water,
normally, i'm not into food coloring
Mod podge+food coloring+ solar light=Unique Pathway/Stake light. Might try mixing the mod podge w/glow in the dark paint and sprinkle some