Mix cake according to package directions.
For 4 layers, scoop approximately 1 1/2 cups of batter into 4 separate bowls. Get as close to even as you can so the layers will be the same size. (I actually used an ice cream scoop adding a scoop to each bowl until all the batter was divided out.)
Mix icing color into cake batter until the desired color is reached. (Color will darken while baking.)
Bake 12 to 15 minutes or until cake is set in the center.
Cool completely before frosting with Cream Cheese Frosting.