I have on in the works actually, zf_highschool. However, I'm fixing up zf_office first, and then I'm finishing zf_testchamber_00 (a portal 2 map for zf). Be patient :3 you can read up on my works in the 'Community Maps' forum over at http://forums.addictiontogaming.com
Why not create zombie escape maps?
If you've never played CSS zombie escape youtube search : D