I really like wide backs when I'm in a hurry but, I usually just use orphan blocks from the front or I just cut squares of the front fabrics and piece a checkerboard strip to make up for adding width. Someone on the board mentioned a while ago, that if you use the front fabrics also on the back, the quilt can be repaired in the future with fabric that has the same fade, wear, ect. I love that concept but don't know if it will ever happen.