Replacing the entire stock fixture with LEDs is getting really popular with the Jeep crowd, because the stock housings are crap. JW Speaker is probably the top-rated name, but they can be spendy (I think upwards of $800 each).
And then you get this goofy shit for a whopping $45 (apparently on sale from $400...???):
View Screen Capture
Reportedly these blast light everywhere BUT down the road....