The installation can be done with the help of a PPA, but a source package is available
Nitrux OS Icons, a pack of handcrafted icons that are compatible with a lot of operating systems, including Ubuntu 13.10, has been updated to version 3.1.9.The icons in Nitrux OS are infinitely scalable, which means that they are compatible with a large number of operating systems and there's no quality loss.
With over 6,000 icons available, it's hard to find a program that doesn't get its own personalized icon. According to the developer, the Desktop folder, Clementine, Dewdrop, Gconf/Dconf/Settings, Eog/Gwenview/Ristretto/Image viewers, Screenshot apps, and Openshot icons have been revised.
Also, the Kdenlive displaying app icon on the UI has been fixed, and the Kdenlive UI icons, Younited, Mathlab, Kwallet, Debian Plymouth Manager, Conky Manager, and Mint Backup icons have been added.
The installation for Ubuntu 13.10 is quite simple and it can be done from a terminal:
sudo add-apt-repository ppa:upubuntu-com/nitrux
sudo apt-get update
sudo apt-get install nitruxos
You can also download Nitrux OS Icons 3.1.9 right now from Softpedia.