I recently built a custom laser rig as a part of an installation for AfrikaBurn 2013. AfrikaBurn is a Burning Man affiliated event and attracted 7000 people this year. Last year I did this: http://www.photonlexicon.com/forums/...inated-obelisk
For lasers I used:
8 x M140
8 x P73
2 x 1W DHOM greens
All lasers knife edged, stacked and combined using scavenged Casio parts.
I used three cheap scanner sets so that I could have each colour maxed and still produce full separate patterns.
Electronics:
2 x hacked sound cards
2 x laserboy clones, PCB from Simone (thanks!)
1 x badpip quad driven at 24V
Software:
CSound software synth
The beam was shone through a water lens. Different frequencies created different patterns on the surface of the water. This was then shone through a fisheye lens and onto the inside of an air supported dome.
Pics tell a thousand words, so: