How to install themes/icons in Gnome shellPosted: 02.25.12
For shell themes:
Make sure the download is a .zip file. For some reason, that’s the only file type that Gnome-tweak recognizes. Then open gnome-tweak-tool (Advanced Settings) go to the Theme tab, and browse to find your theme.
For GTK/window themes:
Extract the folder containing the data into /usr/share/themes. Close and reopen gnome-tweak to add it to the options. If it still won’t show up, open a terminal and type
Go to desktop>gnome>shell>windows and type in the name of the theme (exactly!). Then do alt+F2 and it should reload, plus add it to your options in gnome-tweak.
For icon themes:
Extract the folder containing the icon data into /usr/share/icons. Restart gnome-tweak. They should be there.