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 3.0.7.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 3.0.7:
• Symbolic icons [for elementary OS] have been revised for Gnome Online Accounts, Lockscreen in Gnome Control Center/Switchboard, Google, Calculator, and Various actions;
• Krita and Kexi are now displaying the correct icons;
• New icons have been added for Birdie [+custom icons], eStudio (Baseline), Pomidor, Agenda, Footnote, Geary [custom icons], Kamoso, Kaddressbook, Various KDE preferences categories, Gazette, and Ark.
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 3.0.7 right now from Softpedia.