I am making a rainbow layered cake for DD's birthday - have bumped Onyx's thread about cake mixes - I think the Betty Crocker one is the way to go but I need a white icing for in-between each of the 6 layers and then for all over the top and sides and Im not sure what to use. I have used the BC vanilla one before but I can't stand the taste and it's a bit off-white and was hoping for a white icing.

Any advice appreciated!!

cake.jpg This is the cake Im making!