Interesting post Alistair. However, don't you feel that the lighting in Art Deco was usually fairly subtle, whereas the LED lights are hardly that - on our Porker the LED running lights are much brighter than the sidelights.
I think that they work well on the Audi's, maybe because if I am not mistaken they were the first to have them and the frontal design is very modern and they don't look like an obvious afterthought. I'm not sure they look quite right on the classic 911 shape; not to mention what they would look like on the Aero retro shape.
