The backing is from IKEA, and I love it. They do carry mostly decorator fabrics, but there were a few cottons as well. I picked this up several years ago thinking it would be perfect for a quilt backing, or maybe a border. It's such a huge print that it wouldn't look like anything if it was used for piecing!
By the way, we had 4.75 inches of rain in our backyard rain gauge from Monday's rainstorm. It was a real downpour! Our air is full of smoke from the wildfires in Alaska and Canada, and it looks like the rain picked up the smoke particles as it fell. The water in the rain gauge was pale amber colored.