I'm finally releasing my Grimy Patriot City texture pack that will make the city maps more dirty and less bright and shiny.
To use them just extract the textures into "{modfolder}\Art\library\area_specific\_textures" and off you go.
To revert back, just delete them.
It shouldn't overwrite anything... however IF it asks you to overwrite a file when extracting, it means that you already have a modified texture of some kind (such as the previous building textures I released)... I wouldn't overwrite anything until you are sure what it is. I have included a few building textures for those who aren't using my previous building pack. Those who are using the building pack, I would skip any overwriting of those files (or at least back them up).
http://gpwarehouse.freedomforceforever.com/dirty_city_textures.rar
BEFORE:
(http://gpwarehouse.freedomforceforever.com/tex_before.jpg)
AFTER:
(http://gpwarehouse.freedomforceforever.com/tex_after.jpg)