Video Inverter

Inverting a videos colour is an interesting and dramatic effect. Many programs have been able to do this for ages but without a nice midi controller and a laptop you can't play a VJ gig with them or put them in a feed back loop :)

further more you cant hack the effect for audio reactivity 
without using something like Jitter

here is a website that details a project that was adapted from 
July 1995 Electronics Now magazine using an LM359 IC and here is the circuit diagram from another site 

many mixers and video effects units also have this effect and can be hacked so look for them on ebay and at junk shops (more to follow)