I have been quilting since 2002 and have used coordinating fabrics for the backs of my quilts. However, years earlier I had made several comforters (with really high-loft fiberfill ) and backed them with sheets. They seemed to work out fine. Then much later when I did REAL quilts the thought to use sheets never entered my mind. Just the other day for some reason this question came to my mind. So why not use sheets for quilt backs? Love to hear your opinions.