Whenever a comic needs an environment or background setting, I find it most efficient to make a quick digital painting of the background and then crop it as needed. These are a few that I've used (and re-used) in past comics...do you recognize them? :)
Challenge accepted!
-3 hours later-
1) http://tamteam.the-comic.org/comics/134/
2)http://tamteam.the-comic.org/comics/136/
3)http://tamteam.the-comic.org/comics/183/
4)http://tamteam.the-comic.org/comics/185/
No, am not very good managing my time.
I cannot describe how impressed I am that someone bothered to go look for the backgrounds! Fantastic!! :D