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 3.2.2.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 permissions have been changed, the symlinks for bitmap mimetypes have been fixed, and a icons have been added for Tweetdeck, Google Spreadsheets, 8 ball pool, Gliffy, Budgie, and 4kvideodownloader.
The installation for Ubuntu 13.10 (13.04, 12.10, and 12.04) 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 3.2.2 right now from Softpedia.