First of all, you need to backup your original GNOME Shell Theme. Copy-paste /usr/share/gnome-shell/theme directory to your Home folder If you are doing it via Nautilus, you have to open Nautilus as root. Hit ALT + F2 and type "gksu nautilus"(without quotes) to open Nautilus as root. gksu nautilus Now download the themes from above, extract it and copy-paste the extracted "theme" directory to /usr/share/gnome-shell Thats it. Now to enable the new theme, you need to restart GNOME Shell. Hit ALT + F2 and type "restart". restart

Done. You have your new GNOME Shell theme installed and running great(hopefully). Here is my GNOME Shell desktop.

Thanks to half-left for letting us know about his beautiful GNOME Shell themes.

We saw the quiet evolution of GNOME Shell aka the next generation GNOME desktop environment. Now lets do some GNOME Shell theming. Hope you guys are familiar with Elementary and Ambiance GTK themes. Now they have these stunning GNOME Shell variants which are absolutely beautiful. First of all you need to download these themes.