I just used a terribly printed panel in a pieced back because there was no way you could use it other than chop it up really small but it fit the theme of the other fabrics I was using.
For disclosure, I did get it at the thrift store and maybe that is why it was there, but the whole thing was just so bad. I tugged at the grain of the fabric here, and blocked it there but I just don't think the darn thing was really square -- it was too far off. Made one side as straight as I could along the design and cut the other sides at 90 degree angles and stuff is chopped off on all the other sides. Name brand and it would have majorly peeved me if I had bought it off the bolt like that.