Revealing one of my secrets...
Say you want to play some oriental flavor, but don't want to run an oriental campaign, just put a 'China Town' in one sector of the poor districts - some shops, warehouses, a monastary, temple, a small fortress for a 'samurai' lord, the yakuza are strong here, and perhaps ninja are about. You can basically redo all your previous location sites - temples, guard shacks, alleys, but now do them in a specific ethnic neighborhood. And while there's many human ethnic neighborhoods, you can have elf, dwarf, halfling, gnome and other diversity depending on the type and style of your campaign.
I use China Town, or Little Tokyo - lots.
GP