Did these in the 70's, cut up panty hose and used one leg in each biscuit. I made a small throw. If you want to back it, I think I would cut a piece of backing that was larger. I'd start in the center and tie it, working my way out. When you were done tying the middle, trim backing to about 1" larger all the way around, turn the edge to the inside & stitch all the way around or bind.