There are plenty of icon sets available for Linux desktops and it feels great to see new addition to it, well Xane icons are not new but released almost one year ago under license GNU Lesser General Public V3. Mainly these icons are designed for KDE plasma desktop but also support other desktops such as Gnome, Cinnamon, Mate, Xfce, Unity (lack panel icons), and so on. There are four different variants dark-blue, dark-brown, dark-green, dark-yellow and all of them available in dark and light versions, you can choose which fits your theme. You can report bugs or suggest new icons to include in this icon set via this link. You can use Unity Tweak Tool, Gnome-tweak-tool to change icons.
