Cosmic Travel it's a cool theme for your computer, it was designed for: GNOME (includes GNOME Shell theme), XFCE, LXDE, Openbox & Cinnammon.
1.- Download and uncompress the zip file.
2.- Move the content to the themes directory i.e. ~/.themes/ or /usr/share/themes/.
3.- Select "Cosmic-Travel" via gnome tweaktool or your theme settings program.
4.- Enjoy!
Cosmic Travel it's totally free, if you're enjoying the cosmic travel, feel free to buy me a beer :P
If you are interested in the icon theme, check the following link: Cool icon theme