I just noticed something that surprised me. In chapter 16 of MoR, you'll recall, Harry comes up with a long list of ways to use random things in the classroom for combat. One of them was to ram a wand into someone's eye socket.

In Harry Potter and the Order of the Phoenix, someone actually does attack someone by ramming a wand into their eye socket. The attacker is Neville Longbottom. (And as it happens he has pretty good reasons for doing it.)

So far as I am aware, no one in canon ever sharpens Hufflepuffs' bones to make weapons.