I've read reports of people snorting quetiapine for some strange reason, for what its worth. But really, outside of prison, I don't particularly understand how this class of drug could have much recreational value, aside from helping with sleep after taking too many stimulants or, at higher doses, helping with psychosis from way too many stimulants...
Anyway, if you do decide that this is doable and that you really want to do it, be careful with the dose. It is certainly safer than the earlier generation neuroleptics, but I'd be concerned about the risks of extra-pyramidal side effects if snorting lots of olanzapine became a habit.
I strongly suspect that if you provide some information about why this seems like a potentially good idea that someone could steer you in a safer / more effective direction...