Numix Developer says “Make your Linux desktop and Android beautiful. We design artworks for your Linux desktop, icon themes and applications for your Android devices.”
Some say “It is the best theme out there in the Linux world”
Changing icon theme is better and the easiest way to change the look of your Linux desktop.
Numix-Circle & Numix icon theme is one of the best theme and it uses circle shaped applications icons.
It has custom Symbolic icons, Folders icons, Indicator icons, System Settings icons and more.
How to Install Numix GTK and Icons on Linux Via PPA
Launch a terminal window (ctrl+alt+t).
(you can copy – paste the code).
First Add Numix PPA
sudo add-apt-repository ppa:numix/ppa
sudo apt-get update
sudo apt-get install numix-gtk-theme numix-icon-theme-circle
Done, you can use Unity Tweak Tool for Ubuntu or Gnome Tweak Tool for Distros with Gnome or with your distros system tools for applying Numix icons and theme.
To remove, do :
sudo apt-get remove numix-icon-theme-circle
For more info check here.