Hmm, there are plenty of vintage and new but retro looking dynamo lights. Also very retro function wise.

Such as this one
http://cgi.ebay.com/ws/eBayISAPI.dll...m=310073554276

How much DIY tinkering are you willing to do? You could pretty easily install a drop in LED bulb with a rectifier and and capacitor. If you don't want to run the sidewall generator, you could put a battery pack in a vintage looking water bottle. Some lights might have enough room in the housing to put rechargable batteries inside.