Wow, how beautiful. Pink and green would be my choice, but I would go to your LQS and look around at fabric, keep your mind open to something you haven't considered, you might find "the perfect idea and fabric" I agree that you don't want to take away from the embroidery with anything to showy. Possibly, if you stay with pink and green sashing, a subtle floral, not a busy one, for the cornerstones might be good without being too much.Do you know what style your daughter would like? Something more elegant or thirties style, or solids, I would try to find that out, of course without letting her know the real reason.