I was thinking about coping blocks when I came across this, and wonder if you could make the blocks go from lighter blocks to darker ones, or put 3 of the lighter ones in each corner of the quilt so they frame the edges. I had to deal with this a few times, if I don't order all of my fabric at the same time, it doesn't match; that's an opportunity to be creative, right? Some of my better stuff came from that improvising. Have fun, breath, and remind myself it's gonna be beautiful!