wildyard

Just finished the top of my first ever art quilt. It is my impression of a photo a friend took. First I will post the photo, then the flimsy.
I need to figure out the backing since it will hang on a wall. Perhaps denim or something stiff like that?
The flimsy looks wavy and crooked, but that's the way it's stuck to the design wall. It's really squared up and flat, except for a few wiggles in the sashing. I don't know why it did that as I was sewing perfectly flat pieces together.
Rainy Night Windows:[ATTACH=CONFIG]595340[/ATTACH][ATTACH=CONFIG]595341[/ATTACH]