ICONIC Settings
Steve Kenson has written a city/setting building toolkit for ICONS -called ICONIC Settings. Partly inspired by the city building rules in the Dresden Files RPG¸ the ICONIC Settings rules allow the players to tie setting creation into character generation and devise aspects that are tightly incorporated into their own setting.
This product is a zip file with the setting creation rules and a form fillable pdf to make setting/location creation easier.
Note - these rules were originally available through the Stark City Campaign Setting