Saw this idea over in the suggestions forum, but basically it consists of changing the wording of the standard "Symmetry received 3 troops for 6 regions" kind of template. Take out "troops", and maybe "regions", and replace them with something more specific to the map.
It's just for tone, but I really liked the idea:
Chicago Prohibition you get "schmucks"
Roman maps = cohorts or legions?
Poker Club = chips?
Classic Art = critics?
Edited to make more sense