The installation is very simple and can be done through a PPA
Nitrux OS Icons, a pack of handcrafted icons that are compatible with a lot of operating systems, including Ubuntu 13.04, has been updated to version 3.0.8.The icons in Nitrux OS are infinitely scalable, which means that they are compatible with a large number of operating systems.
More than 6,000 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.
Highlights of Nitrux OS 3.0.8:
• The Empathy, Emesene, Fontforge, Help, Info, Gajim, Emerald, Google+, and Hotot items have been revised;
• Unity is no longer using the symbolic battery icon and Gnome Shell and Cinnamon users may need to re-enable them;
• A few new icons have been added.
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 3.0.8 right now from Softpedia.