This is a simple chromakey map for artists.
Download here.
I made the walls with a single pixel green texture which has a surfaceparm nolightmap shader.
I put a token light in the room, but the actual illumination comes from the _minlight 200 in the map file's worldspawn (line 5 in the .map file, it's in the pk3).
It shows up in the create server menu so you don't have to use the command line to run it.
The pk3 weighs in at a massive 5.0k, is that a record?

EDIT - I've upped the _minlight from 10 to 200 and I think it looks better now. The download link goes to the new map now.