OS-K

Their explanation
OS-K is the most comprehensive icon set for KDE. Not only does it take the best icon art and combine it into an attractive set, it also uses a fine balance of photo realism and simplicity to achieve a clear interface. The icon 'actions' folder contains nearly 300 icons designed with standardisation in mind and they are all created to take advantage of the higher screen modes in use today. All actions can now go up to 128x128!

Our explanation
OS-K icon set is by far one of the best icon set available for KDE. It is the default icon theme in Granular.

Official website
http://kde-look.org/content/show.php/OS-K+icons?content=47278

Related Packages

 * kde-icons-OS-K