The Elementary icons are elegant, and this set has icons for most applications – there are more than 13000. They work well with most desktop environments for Linux, such as Unity, Gnome, Mate, Cinnamon, Xfce, Lxde and so on. This theme can work with any themes – dark or light – the Creator of this theme removed the support for light panels, but still include them in the package, if they you'll need.
Install Elementary icons on Linux Mint:
sudo apt-add-repository -y ppa:teejee2008/themes sudo apt-get update sudo apt-get install elementary-icon-theme