I like both of the ideas posted here. My mind says I would put the 6 blocks in the middle and work out from there. I would use colored blocks, muslin blocks and the greens (or blues) for blocks. I don't always know how I am going to finish a quilt, but I would start in the middle for sure and let the Good Lord tell you what to do. It happens to me all the time. I love your colors for each quilt and please, do post the finished quilts.