I remember there was a Q3 map where all the textures were greyscale and it included some greyscale character skins for the bots that it had set for it. It was pretty good. I asked in a mapping IRC channel before and no-one seemed to know about it. A forum post can get read by more people, though, so I'm asking it here

I think it used a little colour for the "electric effect" on some things, but that effect was primarily white.
I remember it had a mirror that you walked through and it was a teleporter, and it had a moving platform floating in the air elsewhere in the level (in approximately the middle, I think).
Anyway, it doesn't have to be just that map. Any Q3 map that uses all greyscale textures I'm interested in.