We installed three video projectors facing the audience at a small venue, and made a patch in Processing simulating moving heads, strobes and other effects we came up with.
EDIT! I HAVE UPDATED THE SOURCE CODE TO BE INDEPENDENT OF THE DREADED DMX LIBRARY!
Click here for zip with the new source code (for Processing) tested on Mac and PC.
You will need to install Processing at http://processing.org/ and the RWMidi lib at http://ruinwesen.com/blog?id=95
Basic instructions are included in the header of lightTable.pde.