i have discovered the faction colors options some minutes ago in the faction creator
you can creat very funny or pretty looking factions, if you didn't use it before, give it a look
options:
faction color: with one click you can prearrange the next options / you get a "naturally" looking palette for buildings, clothes . . .
clothing 1, clothing 2: the clothes . . . wow 
pimary, secondary: the buildings and built-up tiles
metal: for armours and weapons (if metal) / darkblue or red armour must be great (or any)
roof: roof
map: border, map, flag, building menu, cityname and assignment (in the creator it doesn't change the color for me, but on the map is ok)
if you have some goog looking colorset you can share with us the colorset and some picture (at the moment i haven't)