Pieced Back for Pink and Grey Log Cabin

I didn't want to buy a backing specifically for my Pink and Grey Log Cabin quilt. And I didn't have enough of any one grey fabric to make one. Added to which, I had have seams on the back. So this equals the need for a pieced back. As I planned to do a zig zag quilting following the lines of the log cabin I wanted to do a pieced backing that would reflect this design, this is what I came up with.

It looks a bit saggy here, but I'm happy with how it turned out. I've now got the quilt basted and the challenge will be to make sure the back and front zig zag line up. I think this would make a great, quick quilt project.