In my spare time (sarcasm) I coordinate the Power of the Quilt Project, a joint project of the Unitarian Universalist Area Church at First Parish in Sherborn and the Rhododendron Needler's Quilt Guild. We are a group of volunteers who make quilts for cancer patients and children in need of comfort. We used to have a policy of never taking scrap fabric donations. But when I inherited the project, the inventory included two large bins of scraps, so I assume the policy was abandoned in practice. So recently, I've been cutting the scraps into useful shapes, and one of those shapes is the 3 1/2 by 6 1/2 inch rectangle. These are perfect for the tatami-mat inspired designs in Successful Scrap Quilts from Simple Rectangles by Judy Turner and Margaret Rolfe, which was published in 2002 and is still in print. It's one of my go-to books for inspiration.
pastel scrap quilt from 2011. There are 32 dark rectangles and 38 light rectangles.