On the 12VDC power / bumper sticker thought.
Any geeks want to check this out and let me know if they think it will work, I believe a single LED strip draws only a few 100 milliamps. (.015-.020) on the bench supply if I'm remebering correctly.
Circuit wise figure 19 on page 10 is about the simplest circuit I could find. I'd love to get comments from the hardcore electronics geeks. I'm thinking the ICL7660A part as it allows for 12V input, do Cars tend to be a bit higher than that? I haven't put a meter on one lately.