This is what I used. Just made my own gobo with transparent paper and maybe its been done before but it worked great. I got mine for dj supply and you can get 2 for about $100 bucks.
ill get a better photo up but i sequenced the projector in between songs and its plenty bright in the dark and though its not dimable for the price it works great. My security system uses the other one. Its 2 motion detectors that flash up we prosecute! nothing else,no lights. Just sometimes saying less says more.