* icons/ardmore/theme_preview.png:
        * icons/arlo/theme_preview.png:
        * icons/crux_eggplant/backgrounds/window_pattern.png:
        * icons/crux_eggplant/theme_preview.png:
        * icons/gnome/theme_preview.png:
        * icons/nautilus-mini-logo.png:
        * icons/theme_preview.png:
        * icons/villanova/theme_preview.png:
        New theme previews for the smaller size, and 1bit alpha.
        Also, a couple of other tweaks.