All credit goes to original creator
Backup your theme directory first. Extract the zip file and rename "gnome-shell" directory to "theme" and copy to /usr/share/gnome-shell/. This path is usually where GNOME Shell is installed.
Restart GNOME Shell by Alt, F2, then type r and press enter.
You can use the gnome-shell theme extension for easier installation of themes.
For icons go http://adf.ly/277KT