Thank you QE for the nice compliments. Yes, I know yellow (ugh!) but I did add it to some future blocks. My sashing is a dark navy blue with pale green swirls. I found some white fabric with very faint navy blobby things that I think I'm going to use as cornerstones. It reads mostly white.
As for my method of QAYG, I just made it up. I quilt my blocks with just the batting behind, no fabric. I like Warm & White batting--it's thin enough but holds its shape. It also doesn't get caught in the feed dogs (which I leave up). When I did FWS I made the quilt in 3 sections; then after I attached the backing I quilted the sashing and cornerstones then put the 3 sections together. I'm planning on doing this one (or 2 if I make 2 quilts out of the PC blocks) as one large backing section. I don't know. I'm intimidated by the size of this one.