I shop my stash for the backing. For several, The backing was good as was the top but I couldn't find a binding that looked good on both. That's when I learned to make two sided bindings. For example, I make a baby quilt using one of those Hoffman nature panels (Raccoon). I had a bunch of fat quarters of forest animals that I pieced for the back. The front was primarily in the teal family. The back was in bright green and brown families. Nothing worked but different bindings on the front and back. The book, "There is More Than One Way to Bind a Quilt," is my binding bible. The two sided binding has also sve me when I didn't have enough of the binding fabric.