Well, I figure a fun way to start an RSBS campaign in the post-apocalypse would be to make a map of the area where the pit fights (and some Jugger matches) take place. On my map, the "fringe of the empire" towns are north, getting nearer the "heart of the empire" as you track south (Teixeirum.)
Do you need a map to run an RSBS campaign? Absolutely not, but I needed to do something to waste time. Oh, and this was all done using some basic Photoshop tools.