I've been playing with different themes on my fresh 12.10 and it seems that I deleted default, if you can call it that, theme files from .themes. Now it doesn't show some icons like terminal's and gedit's. Is there a way to completely restore it? Are there any packages to install?
Open terminal Ctrl+Alt+T and run following command:
Reset Icon Pack
After running all of this commands, logout and log back in.