Have you tried putting the picture blooks ramdonly in the center. I think they get lost as cornerstones. Are there any other pic blocks that you could you for that center? Also I think that the bright blue is throwing me off since it is the first color that I see. I would try putting the pic blocks in the center surounded by the green one that are facing with the lg square toward the center. and maybe the bright blocks as the corner stones and the other dark blue blocks as a filler. Show us what you decide.