Scale Baker’s Request™ White Cake Mix according to bag directions. Pour into 10”, 8” and 6” baking pans.
Bake at 350°F for 20-30 minutes. Cool.
Build a 3 tier cake made up of 2-layer cakes in 10”, 8” and 6” diameters filled and iced with Vanilla VelveTop®. Separate equal parts Dawn Select™ White Roll & Donut Icing into 5 bowls. Add red, orange, yellow, green and blue gel food colorings, 1 to each bowl until desired color is reached. Pipe warm icings in alternating colors around the edge of each cake tier, allowing icing to drip down the sides of the cake.