I mostly use sheets. I know, the quilt police don't approve, but they wear like iron and I don't hand quilt. Even if I have a large enough sheet, however, I usually at the very least create an off center stripe on the back with scraps from the front. Just a little signature thing. Some quilts I just use the whole sheet. And sometimes I have to make the stripe because I'm using scraps from other sheets I've used for backs.