I've added the sashing and sewn the blocks together. I omitted the cornerstones, even though I love how they look. I thought the top looked busy enough with this fabric and didn't have an appropriate fabric to use anyway.
If I had had enough of the brown leaf fabric I think it would have made a nice sashing. I have some fabric left over so I might play with it to see on a smaller project. The piano key border will add about 6 inches on each side so this will be a nice size when finished. I'm thinking of backing it in flannel, but that's not certain.
Hope everyone enjoyed Labor Day 2014.