Zipper quilt back by Frances Moore at frantastic-stitchwitchery: "This is one of my favorite ways to piece a back. Vertical or horizontal, it is fun." I usually don't do piece backs but this one is doable.
Back of Kat's gifts quilt at Life In Pieces - looks like a bow!
Robert Kaufman Kona Solids- back
Sue Daurio's Quilting Adventures: 2014 Quilts Interesting line quilting with added horizontal lines to the vertical line quilting.