A shank (beef shank, not pipe shank)cut from a cow femur is about the only piece you could make a bowl from (right after roasting it and eating the marrow (tasty)). For the shank you'd have to experiment with different things. A human radial bone might work for a pipe shank but you'd have some 'splainin to do if you get found smoking pipes made of human remains. A deer's leg bone is comparable size. hmm.
I'm not worry about inhaling any bone dust. Trust me I inhale stuff on a regular basis you wouldn't even want to think about.
The slip schmitz was refering to sounds promising.
No skull pipes, silly. Everyone knows those are for cereal bowls.