[quote=@Buddha]
<Snipped quote by Asura>

That depends. You're talking about making weapons out of bones? I'd say make it into a custom jutsu, and if it causes you to go over the limit, then I'll see it through the fingers.
[/quote]

In this case, I actually mean the plates of bone Kimmimaro had under his skin. It's never mentioned as a jutsu, so I'm unsure if it's just an innate thing which comes along with his KG.