A month ago (sheesh time flies)—I taught a class at the Rocky Mountain Crazy quilters  about the buttonhole. We started with “Buttonhole 101″ and then worked through some options you might use in crazy quilting.
See my sample cloth to the right. The top left is the “101″ and then below that is putting it into a wheel (which can be very pretty). Next to that (to the right) is the buillion buttonhole) and then the knotted buttonhole at the bottom done a few different ways using some different suggested techniques.