I used 2 white cake mixes and separted the mixed batter into 6 bowls. A generous amount of gel paste food coloring was used to achieve these bold colors.
Starting with one color, pour a 1/2 cup to 1 cup into the center of the pan. Do the same with the next color but pour it on top of the first color. It pushes the first color towards the sides of the pan. Continue doing this with all your colors.
This is the cake after baking the normal time indicated on the box.
Ok, yes this is a pretty ugly cake on the outside. I didn't spend much time on decorating and I'm not the best cake decorater anyhow. Its something I need to invest into a class for. Maybe this could qualify for Cake Wrecks! ;)