If you want to bind all the angles check out the binding odd angles tutorial at ankatreasures.wordpress.com. You could add a extra row and chop them off or do a facing strip. When you do a facing strip, it is done just like you do a fancy collar (scallops). You sew a good size strip to the edge following all the angles and cut notches in the seam allowanges at all the angles. You then fold the whole facing back and hand sew it to the quilt/wallhanging backing. It is kind of tricky and you have to work to get a crisp edge but it can be done. Good luck and I would try a little sample row before trying it on my wallhanging.