That's lovely thimblebug!
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For the border I decided to add one line of blocks so the white centers ended on one white square. I also just sewed until the 2 1/2 inch squares was close to depleted. I didn't know I had so many scrap squares! I have now completed this throw size, and a queen size. I'm pretty sure I have enough blocks left to make a baby quilt as well. I have one quilt in front of these to quilt then will get to the sandwiching and quilting as soon as I find a pattern to quilt.