Heat oven to 325 degrees. Grease and flour 12 cup fluted tube pan.
Make cake mix as directed on the box using your egg whites, water and oil.
Divide the batter into 3 bowls.
Using your selected colors, color each bowl a different color.
Pour half of the batter in your first bowl into the pan. Don't spread it around.
Pour half of the second batter into the pan..again no spreading. It's ok to not be even.
Pour half of the last bowl of batter over the previous layers in the pan. Again, NO SPREADING!
Repeat these steps using remaining batter.
Bake at 325 degrees per box's directions. Mine took about 45 minutes.
Remove from oven and let cool on rack for 10 minutes then remove from pan.
Let cool one hour.
FOR THE FROSTING
Divide the container of frosting amongst three bowls.
Add the matching colors to the cake to the bowls of frosting.
Microwave each bowl until frosting is consistency to "drizzle".
Drizzle the three colors over the top of the cake...flat side down on plate of course:)
Notes
Cannot wait to try this with some bold colors! I would imagine you could do this in any shape pan...maybe just different effect inside. I will be trying it soon! If you do...share it with me! Love to hear how it came out!