You could offer this service to thousands of organizations around the country. The potential is there. However, it is easy for me to spend your money on a die.
The samples posted above are just perfect and I thank them for posting. I would make it "FR" with FreeRepublic.com in small print. Remember, the purpose for this is a quick identification.
I gave it some good ole red, white & blue rather than that black on white.
Measures about 5" x 3.4".