Watch 50 Shades of Graytall from TekAdvisor on www.twitch.tv
This might be a bit of a joke wad, started on a dare to create levels entirely out of Doom's grey textures, but the gameplay on those maps was quite good.
[DoomWorld Page](https://www.doomworld.com/idgames/levels/doom2/Ports/megawads/50shades)