Thanks, Canny, ten, Krule, Zab, Demi, and Kretcher! For whatever reason now was the right time for an OSL project. I'm sure if I'd tried this a year ago it would have been a train wreck.
Demi, a forest scene was my original plan for the base. I really liked the idea of placing some tree trucks and then painting long shadows away from the lamplight. I get the feeling he'd benefit from a solid dark backdrop though. I can think of a couple ways to do that with a forest scene... I just don't want the base to become too large.
Canny, I hadn't thought about doing a town scene but that's another interesting idea. Creeping through some dark alleyway at night, lots of possibilities. The Figone scenery that Zab pointed out also got me thinking about doing a Moria themed base. I might start on a couple different bases and see which one I like the best, then just finish building that one.