This video shows a classic Voss electrostatic machine that produces 2mm sparks. It is made of 2 ordinary cd's and uses a capacitor also made of 2 cd's.
The machine is also known as a Toepler-Holtz machine. I'm trying to get a better knowledge of the characteristics of static high voltage
Most info i got from: http://www.coe.ufrj.br/~acmq/electrostatic.html