My very first quilt was denim using our old jeans. It was for my daughter who was in HS. It started out 10" squares. The back was a lighter weight denim and I tied it off. Sounds good, but by the end I had fought that denim, the squares were wonky, my fingers were sore from tiring with red yarn, but it looked mighty good to me! My daughter is 30 today and the quilt is doing fine. Denim will live forever and is heavy without batting. I didn't do anymore quilting until a year ago.