Malys -ex is the newest icon set created by the prolific artist Jonny Malys. The main style of this icon set is a spherical symbol inside a square with nice color combination.
Here is a screenshot of this beautiful icon set:
To install Malys -ex, you can just download it here then extract the icon folder to /usr/share/icons.
If you are using Ubuntu or Linux Mint, just open the terminal and run this command to install Malys -ex from the PPA:
sudo add-apt-repository ppa:noobslab/icons sudo apt-get update sudo apt-get install malys-ex
Related link: More nice icon sets for your Linux desktop