McCormick now offers natural food colorings made without petroleum based products (like synthetic food colorings are made of). We completely avoid synthetic dyes in our house as they can cause so many health and behavioral problems.
Amazon has a nice price cut on McCormick Color from Nature food colors when you choose Subscribe and Save. Pay a little as $5.08 for 3 resealable packets of pink, blue and yellow food-based food colorings, after the 15% off Subscribe and Save discount. Other natural food coloring brands go for much more than this, so this is a great price!