Thank you for all of the lovely comments. If anyone wants to make this or something similar, I used this tutorial:
http://www.seamstobeyouandme.com/201...p-piecing-way/
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I stopped at the "Chain 2" part. It was at that point that I knew I was in trouble. I ended up laying everything out and trying to make it large enough and interesting enough without making more stamps. This was the layout I settled on:
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Then I just cut pieces of white at 8.5" x 4.5" to fill the centers:
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Then I added 11.5' x 8.5" white squares in the center and some 2.5" sashing between the rows:
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Finally I kept adding borders until it was the size I wanted. I refused to buy extra fabric for it, so I just pulled whatever I had that I wanted to use up. All of the white is bleached 44" muslin and the backing is a flat sheet.
The quilting part is simple serpentine stitches with almost equal spacing from top to bottom:
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