[header] How to make a colorful roll up cake [title] Split and color your cake mix appropriately. [step] If you were using the colors from the bisexual cake you would split your mixture into three bowls. Then color one pink, one purple and, one blue. 
[title] Spread your colored mixture onto a greased jelly tray, or something similar, using a piping bag. [step] Feel free to use any pattern that appeals to your interest.