I know I'm not the only one here that's into archery. And I would be very surprised if I was the only one here that had ever broken an arrow (or at least rendered it un-shootable).
So what do YOU do with those arrows that will no longer fly?
I make camo pens. Well, not really "make", but you get the idea.
Just cut it to length, clean up the ends, and a Bic will slide right into place.