I found these radar icons on SimDes.org - they are a nice alternative for shortcuts to the default AirNav RB icon and even come as larger .PNG for desktops, etc. Comes in five colors,
free download. Helps me pick out RB from my tiny tray icons much easier.
Link: (top row, second icon download from the left, - they ask not to use direct download links)
http://simdes.org/?page_id=149
Example below