Many years ago -- almost twenty, I think -- I did costumes for JOSEPH AND THE AMAZING TECHNICOLOR DREAMCOAT at our local community theatre. I used twelve different colors of denim to make overalls for each of the brothers. I cut all of the leftovers into twelve-inch blocks, which I sewed together to make a false proscenium for the stage. When the production was over, I sewed the blocks together to make a huge picnic quilt, which we are still using today. It didn't need backing or batting of any kind because of the weight of the denim. I did it all on my serger using a plain four-thread stitch. Yes, the seams are a little lumpy; but, when it's on the ground, no one seems to notice them. It goes through the washer and dryer without any problems whatever.