If you are looking for a new icon theme for your Linux, Shadow may be your choice.
If you're looking for a cool icon theme option for your Linux distro and want to put up a well-styled theme with a slightly different concept, especially if you like the famous long shadows, you'll love the Shadow theme.
Shadow is a flat theme for GNOME 3.10+ and child interfaces In version 4 it contains over 980 app icons and over 2200 system icons and the like.
Installing the Shadow Theme
Download the theme from GitHub or "GNOME Look", it comes in a zip archive, just extract the theme from the archive to the .icons folder (dot icons) inside your personal folder. Then just make the theme change by the appropriate software to your graphic interface. 
On Linux Mint you can use your own system settings and on Ubuntu, use GNOME Tweaks.
Who wants to do the installation process by the terminal can follow the following steps:
git clone https://github/rudrab/Shadow.git
mv Shadow-master /home/$USER/.icons/
If it's from Gnome-Look, just download and extract .tar.xz into the icons folder you created.
That done, you can now enjoy the new theme for your system.
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