Heritage licence plates here in Australia are very popular with collectors and are forever going up in price. Heritage plates look like this. They are enamel. Start at #1, which is the most expensive by far. #2 and #3 also command big bucks as do special numbers like #288, #911, #997 ect........ http://cgi.ebay.com.au/2007-Porsche-911-997-MY07-TURBO-AWD_W0QQitemZ110094000563QQcategoryZ10779QQrdZ1QQcmdZViewItem
I've always liked Euro plates, even though they would look ridiculous on my car. As for the worst license plate ever... MICHIGAN BLUE! UGH! http://www.netstate.com/states/links/images/mi_license_plate.jpg