Stay tuned for even more changes.... I found some other material I am using for the center square which allows me to make not 12, but 24 more blocks. I will alternate the different blocks. The corner stone is the same as the center of the block. But I will also be alternating those with the other centers. Happy now that I can make it larger, still thinking about the border. may or may not use one now that I can go bigger. Will post photos tomorrow or Friday