Black Folders for Faenza Icons by tiheum [link]
Faenza Icons [link]
have to be installed, as this theme only replaces the original folders.
To install the icons, extract the .zip file to ~/.icons or to /usr/share/icons for systemwide use.
If you want to use the Faenza-Dark version, you have to edit the "Inherits" line in the index.theme file to "Inherits=Faenza-Dark,gnome,hicolor"