I work in the office of a mechanic shop. The shop gets 25lb boxes of "rags" for the mechanics to use. The boxes are stuffed full of old cut up flannel pj's, baby blankets, sheets, all cut up but still in sizeable cuts. I've snagged a couple of white pieces to use on string blocks. I've only done a couple of blocks but I LOVED working on them and plan to do a scrappy string quilt.