I think there are quite a few possibilities here!
Have you thought about grey? Green is another one I could see. But I also liked the mock up with the purple and the green cornerstones (yep, purple for a man!). If you want to go with the shadowed blocks, then don't make the shadows orange! Shadows should be the darker fabric (e.g. black or charcoal), otherwise they will stick out too much and not actually give the impression that they are "behind" the blocks!
Looking forward to see what you chose!
