@Bahmo i think you mean the
ARTSTYLE_XX-tag in the
CIV4CivilizationInfos.xml.
to have different cities for the civilizations, or better the culture-regions, you have to edit the
ARTSTYLE_XX-tags in the
CIV4CityLSystem.xml (in this the tag is named
ARTSTYLE_ALL, cause all culture-groups uses the same style) and, not to forget, you will have to do the graphics for yourself since there aren't other city-culture-graphics with the game.
but in the warlords-expansion these will be solved so that the greeks have another city-style than the germans or those again than the chinese
/edit: it seems i was way tooooo slow