Spice Up Your Linux Desktop With The Moka Project GTK / Icon Themes
All the Moka Project GTK / icon themes are available in repositories for Ubuntu / Linux Mint (Launchpad PPA), Fedora, openSUSE and Arch Linux (AUR). The themes are free to download but there’s also an option to donate to help its development and for this reason, I won’t add installation instructions here. Instead, head over to the Moka Project website and simply click the theme you want to install, then click the Download button and follow the instructions.

To change the GTK / icon theme, use a tool such as Unity Tweak Tool, GNOME Tweak Tool, Ubuntu Tweak, etc.