Well, it seems kinda obvious, but you can pick pretty much any era in history (wild west, mideveil, industrial revolution, WWII, ect. ect) and see what scenes people come up with. Really, this is pretty much the 'Space Scene' challange using different themes.
I would also like to see a 'Vehicle Challange'. You could either design your own originol creation or an existing one. I can picture a bunch of street rods outside Mels Drive-In right now. Or maybe Don Garlets Swamp Rat (which I had the pleasure of seeing in action before he retired) at the line ready to launch. Hell, this would be even better animated . . . wheels are turning now.