The installation is very simple and can be done through a PPA
Nitrux OS Icons, a pack of hand-crafted icons that are compatible with a lot of operating systems, including Ubuntu 13.04, have been updated.Nitrux OS Icons are infinitely scalable, which means that they are compatible with a large number of operating systems.
More than 6000 vector icons have been included in this pack and all of them are hand-painted. A minimalistic approach has been used to design the icons and to avoid cluttered desktops.
The latest update for Nitrux brings a set of revised WPS Office icons [apps, mimetypes] and new icons for Foto, Unsettings, Converseen, Python 2.7, Unity Tweak Tool, GrooveOff, and Screencloud.
The installation for Ubuntu 13.04 is quite simple and 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 right now from Softpedia