I found this doing a search.  It's a site which has rubber stamps, some
very nices ones I might add.  You could use the sample graphic on the
page for the tattoo, I'm sure:
 
http://www.krittersinthemailbox.com/animals/ferrets/rubberstamp2.htm
 
Roary
Albuquerque, NM
[Posted in FML issue 4925]