All icons are available for use under a Creative Commons ShareAlike license.
Super Flat remix is a pretty simple icon theme, derived from Ultra-Flat-Icons, Paper and EvoPop icon themes. It's design is mostly flat with a subtle use of shadows, highlights, and gradients for depth.
It has been designed specially for GNOME shell 3.16 but it should work with most Linux distributions; Gnome, unity, cinammon, xfce, kde, etc.
This theme was made to fit with the Super Flat Remix GNOME theme.
Official webpage: http://the-ilife.com/post/127
Uncompress the zip file.
Copy the folder "Super Flat Remix" to .icons in your home directory.
Select "Super Flat Remix" as icons in the Appearance page of your system configuration.