I use muslin to back almost all of my quilts, I really don't care if it's "boring" or not according to some folks. :-)
I mostly use bleached white, and I am really getting into dyeing the muslin for backing. In fact, I just did a grey dye for a backing on the quilt I'm trying to get finished for my husband. He loves it because it's unique, and I love it because I bought the high quality muslin from JoAnn's when I had a 50% coupon, plus a 15% off on total purchase coupon. I have a beautiful, totally unique backing that is 120" wide for which I paid less than $20. No piecing involved, and I think it's far from boring!