Blue jeans
My sister only quilts with denim. She makes quilts and totes. She cuts the blocks out of the legs and used either a 5 or 6 inch block. She does not put batting in them. She sandwiches the flannel and blocks and sews around the blocks to stabilize them and snippes the seams. She also cuts out nice back pockets and includes them in the quilt or any such trim.
They make excellent camping quilts. Her totes are really cute as well. You just make them as large as you want. She puts an outside pocket on them as well. She used to make BUM Bags as well. They were just the top of the jeans. She cutes off the legs, sews the legs closed and makes a strap from the legs. They are really cute as well.