The backing fabric for Rainbow River is just as colorful as the top. And yes, I had that in my stash! I still have 2.5 yards of it left for another quilt. When I find potential backing fabrics on sale for $2-4 a yard I usually buy 6-8 yards so I have enough for anything from a twin to queen size back. I have had this piece for a long time, maybe 10 years, so the quilt was finally made that needed it. It is a Hoffman of CA fabric.