I've been thinking seriously about some self-knife play myself, but not "cut myself" as much as "surface scrath"... don't really have a goal of drawing blood. I've tried it once (with a pretty much dull as possible knife) and it was interesting, though I didn't do that much with it for a first time. Small steps and all that.

I have this aluminum thing that I think is designed to be some sort of pizza paddle... but there's only one kind of paddle it reminds me of these days. Honestly the shape is straight out of the adult toy section. If it didn't make the most comical clanging noise when it hits stuff...