Install faenza-icon-theme by entering the following commands in the terminal:
sudo apt update sudo apt install faenza-icon-theme
Description:
Faenza icon theme
The Faenza icon theme provide monochromatic icons for panels, toolbars and buttons and squared colorful icons for applications, devices, folders and files.
Homepage: http://launchpad.net/~tiheum/+archive/equinox
Version: 1.3.1-1
Section: universe/gnome