I think of Tiffany stain glass when I think of Great Gatsby, Frank Lloyd Wright designs, flappers, clean straight lines, fansor clam shells types, scrolls like peacock feathers and art neuvaeu and there was really awesome cars from that era too. This link will give you some visual ideas too.
http://images.search.yahoo.com/searc...sign#index=srp
hope this helps a bit...
Tricia