Small stage lighting type fixtures like this.
For anyone thinking of making this:
I'd highly suggest some mini par cans for that stage light look:
http://www.amazon.com/Odyssey-PAR-Pro-Spot-Black/dp/B0002IJG9Q/ref=pd_sim_sbs_p_6
If you're going for a bigger install I'd suggest an ellipsoidal light. Dat leko FTW.