Hmmmm... all of my antique quilts are backed with white and by the looks of the handwork on them, they were made by "real" quilters. The quilts I make are backed with white, off white, stripes, or whatever fabric I have the most of that's a good match for the front (though when doing my own FMQ I do lean toward backing with a print because it hides many of my numerous mistakes, lol!). You just go ahead and use whatever color you want to, it's your quilt!