A great place to look at ideas is:
http://www.carnut.com/nindex.html
They have a lot of pictures under Car Pics including some PT Cruisers. My favorite pages on their site are:
1935 Fords:
http://www.carnut.com/photo/list/ford35.html
1936 Fords:
http://www.carnut.com/photo/list/ford36.html
Another great source for flame designs is your painter. Once you've found a good painter, he or she should be able to show you some of their work.
Here's what mine came up with:
DB aka Basset Hound
Pics at:
http://members4.clubphoto.com/don284358/