A Rainbow of Japanese + and X Blocks?

My Japanese + and X quilt is gradually growing in size.  Here is my 9 X 9 layout.  At the moment, I'm thinking I will go for a 12 X 12 layout so I'm over half way done now.  I'm also playing around with this rainbow-ish layout.  I know when I polled last time whether or not to arrange this quilt randomly or arrange by color that I had more people chose the random look over arranged.  I especially liked one person's description that random looked like light coming in through the trees.  Still, I want to play around with the arrangement as the quilt grows and see how it evolves.  I also realize that as a bed quilt it might not look as interesting to have the rainbow effect as it might if it were a wall hanging instead.  Still, I have a long time to decide yet...