Lightning effects for a small venue stage?
I'm looking for DIY ideas for creating some lightning on stage at a small venue. The venue is called "The Laboratory" so you can see where the inspiration for the idea comes from. It needs to be impressive and easily visible but self-contained and safe enough to be operated by a run of the mill stage hand. Any suggestions are welcomed, but i was thinking along the lines of a large van de graff in a spark cage of some sort or something along those lines. I also have to take things like size, cost, maintenance, and complexity into account. I am not an amateur but I have never attempted any true high voltage projects. Any questions or suggestions are welcome. Thanks for the help!