Since we have that mat also, I'm especially interested in your finished product. We bought some striped fabric with the intention of making a valance, but so far the window is bare. I think if the project had been more "quilty" we might have been more motivated to jump into it.
What color are your walls? We matched the blue in the mat with our paint, and the vanity and med cabinet are a dark espresso brown. The shower, sink, and toilet are white. We love the room, but we need to put some finishing touches to it.