I feel like mapping stupid. So how about the following theme:
Use cheats you fuckers I give a fuck about balancing this thing. Silly fugly textures and more than 100 monsters. Not to forget gameplay that feels like cleaning your toilet after diarrhae. I mean very stupid and fun maps that entertain you in a wonderful goofy and meaningless way.
"fuck you this is no theme and it's silly"
I had some certain speedmap in my mind, by necros I think, it was quite like sm26_necros but with swimming and way more weird. sm48_crap (the map with the hotdog) should be good inspiration too.
Here are some inspirational shots:
http://pauk.fov120.com/speedmaps/images/pak26_9.jpg
http://pauk.fov120.com/speedmaps/images/pak21_2.jpg
http://pauk.fov120.com/speedmaps/images/pak20_5.jpg
http://pauk.fov120.com/speedmaps/images/pak19_5.jpg
http://pauk.fov120.com/speedmaps/images/pak17_2.jpg
Deadline would be sunday night so I could compile the pack monday morning (CET).