SFM map ideas for 72hr contest?

The Siphon

L6: Sharp Member
Mar 2, 2015
278
190
I tried to think of a map theme for 72hr contest, I'll be doing some small/medium SFM map, hopefully interiors. (Because I hate 3D skyboxes etc.)

But I don't have any good theme for the map. So I am asking here for suggestions. The SFM workshop is pretty empty, so all themes are welcome.