48px color icons for firewall-config and firewall-applet.
22px, 16px monochrome icons for the system tray: firewall-applet, firewall-applet-error and firewall-applet-panic. firewall-applet and firewall-applet-error are symlinks to security-high and security-low, but firewall-applet-panic is a new icon because security-medium does not accurately represent panic mode.