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Tesla Costume

Hello, so this year for halloween I am hoping to go as our hero Nikola Tesla. the costume will be fairly easy I'm just planning on wearing an old suit etc. but what i really want to do is incorporate some type of electrical effect into the costume. I know a bit about electronics and can solder and figure things out when needed, all i really need is an idea of some type of electrical thing that wouldn't kill me and i can power via batteries. 

in a perfect world I would like to create some type of spark gap generator between my hands but this might be too lofty an aspiration. 

Anyway if anyone has any ideas specifically ones that wont kill me and aren't too hard to accomplish i would be very grateful.