I made a 44x76 rag quilt of the heavy denim jeans and chamois weight flannel. It weighed over six pounds. Denim jeans seem to come ib almost canvas weight to very light weight. Flannel also comes in various weights.I had a hard time finding the extra heavy weight flannel.
The was made of five inch squares sewn with half inch seams.
You could embellish some of the squares before sewing them together.