I Love Dick Eastman's new license plate: http://blog.eogn.com/eastmans_online_genealogy/2008/03/new-license-pla.html
I don't have a vehicle to hang one on (I'm a good environmentally minded girl) but if I did, I might choose this one!
To make your own vintage or modern license plate for Canada or the U.S.A., go to License Plate Maker. (For scrapbooking, maybe?)
It's free: http://buy4cheap.brinkster.net/signs/license/plates.asp