Those in the habit of making up ferret-related flyers, posters and such may
be interested in this clip art web source:
 
http://www.arttoday.com/Search/
 
If you are not a "member", you are limited to retrieving 15 low-res jpegs
per search.  However, if you do a creative series of *narrow* searches,
you'll probably find something great for a flyer or webpage.
[Posted in FML issue 1898]