I've been sewing all day - and still have a lot of piecing to do, but I also was planning on 36 block instead of 9. Now that I see the whole pattern, I think I'm going with 5 across and 6 down, and then will use another 12" each side for the border.
I was really excited to see how it was going to look with my fabrics, so sewed up four blocks to put together. I'm glad I kept looking for a background that I really liked.