1 white cake mix
Icing
Cake coloring

Mix up cake according to directions. Place 1 cup of cake batter into 4 to 6 separate dishes. Place 1 or 2 drops of coloring into each separate dish of batter. Pour remaining white batter into a baking pan. Take each dish of colored batter and drop 3 tablespoons into the pan of white batter. Take knife and swirl colored batter around. Bake cake as directed on the cake box.