Inside the Rainbow Cake

I forgot to post photos of the inside of Jaynie's Rainbow Cake!  Check it out!  This cake was featured by Kaitlin Flannery on The Martha Stewart Show last month.  I just used Duncan Hines (the best brand for boxed cake mix, btw) White Cake mix (I used 2 boxes) and used Wilton Dyes.  I did use Kaitlin's Butter Cream recipe (on Martha's site) andit was SPECTACULAR and very easy to make.  19 egg whites went into the cake and frosting!