These are mainly darkened versions of the default units, however some bits and pieces are recolored or retextured. These didn't take much work, but they look noticably better then the default skins, in my opinion.
Copy all files in the "Art" directory in this folder to the art folder located within your Rise of Nations directory. (Default C:Program FilesMicrosoft GamesRise of Nationsart)
Make sure you back up the original files.
Heavy Machine Gun
Advanced Machine Gun
IndustrialModernInformation age Merchant
Red Guards Infantry
Elite Special Forces
T-34(Russian Modern age Tank)
Added a unit_graphics.xml mod to incorporate these skins without replacing the game's art files directly.