Mitered corner with matched print. Not bad, huh?
Let's see if I can make the rest of them come out like this.
Oh, and by the way, I ended up keeping the dark brown stop border at 1-1/2" wide. I didn't want it to be the same 1" width as the sashing components, and I was afraid if I went any narrower than 1" that I couldn't keep it looking straight enough when I attached the outer border.