I chose to be festive. :3 Guess how I drew it? With a mouse on my laptop!!! (I know, it's hard. This was the best I could do. @_@) Made the rainbow transparent using some ghosting blocks and things.
@LushMushroomCAT gave me the idea to do the pepperminty-rainbow. (I really hope you don't think it's copying. But it was SO HARD getting it all right.) @GazerOfStars for the original base and idea.