I had to too! Awhile back a friend posted this link and I bookmarked it thinking 'someday'. Well, a bunch of friends made their versions and I just couldn't resist making my own.
I used Wilton Gel food coloring and used applesause instead of oil,
but I just couldn't bring myself to use pop.
Here is the mix, in hindsight I would have put more of the purple/white batter in the bottom of the pan. You know what they say about hindsight!