We have functioning LEDs this year. A writeup of how we accomplished this is here:
http://degreesplato.wordpress.com/20...s-need-lights/
The lights will pulse teal (our team color before and after the match,
purely decorative). During the match they indicate the direction the
drivetrain is pointing (it's reversible). The NXT is also keeping a
match timer and they will start flashing yellow at the beginning of
the end game and flashing red with 10 seconds left. I thought the
timer might be inaccurate, but it's surprisingly correct.
There's various stuff we do in autonomous, mostly for debugging
as well.