Is this your planned layout? If so I think I would sew the HST into larger blocks. If I were to do this I would assemble 9 HST into a 12" block. Then once you have your blocks sewn you can rearrange them to your liking, easier to work with them on your design wall. You have a nice mix here and if two that are the same end up next to each other it won't be noticable except to you.