Satya, who has created some beautiful GNOME 3 / GNOME Shell themes such as Ambiance Blue, Minty, Dark Shine and many more, has uploaded all his themes to a PPA so it's now easier to install and stay up to date with the latest versions of his themes.
To add Satya's Themes PPA, use the commands below:
sudo add-apt-repository ppa:satyajit-happy/themes
sudo apt-get update
Then simply run the command to install the theme you want (see below). If you're not using Ubuntu, click the DeviantArt links and follow the instructions to install the themes.
Minty GNOME Shell theme - DeviantArt link:
Install it in Ubuntu:
sudo apt-get install gnome-shell-theme-minty
Elegance GNOME Shell theme - DeviantArt link:
Install it in Ubuntu:
sudo apt-get install gnome-shell-theme-elegance
Shine GNOME Shell theme - DeviantArt link:
Install it in Ubuntu:
sudo apt-get install gnome-shell-theme-shine
Dark Shine GNOME Shell theme - DeviantArt link
Install it in Ubuntu:
sudo apt-get install gnome-shell-theme-dark-shine
Aqua GNOME Shell theme - DeviantArt link
Install it in Ubuntu:
sudo apt-get install gnome-shell-theme-aqua
Besides the GNOME Shell themes mentioned above, the PPA also provides Ambiance Blue Theme Suite - a pack that comes with a GTK2, GTK3 and GNOME Shell theme, as well as Evolve GTK (2/3) theme.
Ambiance Blue Theme Suite - DeviantArt Link:
Install it in Ubuntu:
sudo apt-get install ambiance-blue-theme
Evolve GTK Theme - DeviantArt link
Install it in Ubuntu:
sudo apt-get install evolve-gtk-theme