I have been asked to do a rainbow cake. Problem it it is for a wedding cake. Now, if I was using 8" pans all through, could use the checkerboard inserts. However you know how big wedding cake layers can go. My thought is make a whole lot of batter, separating into several bowls to color them. The question is what is the best way of putting the different colors in the pan to get several colors in one pan? Yikes!