I like your Diamond alot. The back could be cool, I am trying to picture it, Might be best if you just do the back and see what people think. Also, a great writer once said you should never show people your unfinished work. If you have some vision in your head, untill you get it done, we are not all going to be able to understand what you see.
But the concept sounds cool, all those colors, probably look cooler then the bicycle rainbow deck.