I used an old blanket a number of years ago. If you're old enough to remember, it was one of those blankets made of foam and when new had nice soft fibers somehow embedded. But as it was washed the fibers came out so I was left with this giant foam blanket. I made a picnic quilt using the legs of DH's Dickies work pants. (He always wore through the knees but the rest of the pants were in good shape.) Nothing fancy, just stitched the pieces together. With a flannel backing this was a very heavy quilt and perfect for throwing on the ground at picnics, etc. Over the years it somehow disappeared. I'm blaming one of my kids cause I surely wouldn't leave behind one of my creations, even if it wasn't fancy. ;)