I am making one right now with the URL of the Bible camp's website. This is the camp that does an annual quilt auction fundraiser, and I donate a few quilts each year. Justflyingin, a member of this board was helpful to me with tips for the QR quilt. I am about 1/3 done piecing now. My squares are 2" with a 1/4" seam. It should work up to about 40" square. My QR code works on paper, but I am holding my breath that it will be readable when I am finished and that I don't make a mistake somewhere piecing.