About the only thing I haven't experienced is some temperature play-- either hot or cold. Maybe with the gal having some ice in her mouth or red hot (cinnamon) candy in her mouth. I'm sure that would be an interesting experience.
As for spit or swallow, I obviously favor the swallow over the spit, but it is not that big of a deal. On the plus side, I've stumbled onto a local cum slut. She takes every drop and swallows willingly with a smile on her face (along with some other stuff
). Gotta love a gal who knows not only how to give head but also how to finish.