It is a modification of the Oxymentary Icon Theme by Linux Mint 17 Qiana KDE, trying to make the icons more homogeneous and harmonious between them.
The screen contains only some small sample, in the Theme there is a lot more ... just try putting it in /home/your_name/.kde/share/icons

Better with these icons: http://kde-look.org/content/show.php/oximentary+Armonico+%28Home%29?content=168399