Here's mine; I actually did most of the work last month before I got the car. I used 40 "pirhana" style LEDs (specifically Liteon LTL914SEKS) in 10 strings of 4. I used various sizes of resistors -- 220, 180, and 100ohm -- trying for a 'tapered' effect, but I think that was a mistake, and I'll probably make them all 150 or 180ohm when I get around to it.
I used 5 small pieces of protoboard instead of one large piece because that's what I happened to have on hand.
I stuck them together using pieces of card edge from some old PC. After a bit of trimming I got it to fit the Fit.
Bench test... By the way, this was taken in a lit room, with flash.
Before and after... unfortunately the sun moved (well, OK, actually the earth turned) so this doesn't say much. I think the LEDs may be a little dimmer than the original bulb, but the instant illumination makes up for it; they really do come on noticeably before the bulbs.
Finally, here's the obligatory nighttime christmas tree:
