I loooove crumb blocks! I have made 3 crumb quilts so far -- a wall quilt, a baby quilt, and a bed size bear's paw where the paw pad was made of crumbs. Now I'm working on a 4th, which I hope will become bed or throw size. It's made of neutral crumbs surrounded by a thin strip of either purple or dark blue. The strips come out of my string pile. I like to divide the crumbs into color families and sew them according to their families rather than just randomly. That gives some cohesion to the block as a whole. The bear's paw quilt I did is made from blue, purple, and green crumbs, thus an analogous color scheme.