Here's what I'd love to do:

Take a Peggy 2, and break out all the LED connections into a single strip of white (I would use Blue, but law enforcement might have issues with that) ultrabright LEDs, which then get placed just under the hood of a car (Like KITT).

Use the Peggy to drive the LEDs (from a car source, so 10-15vDC) like a Larson Scanner, but with a few additions/alterations:

• When a signal light goes on, the "eye" moves to that side, then "bounces" on that side, being pulled back by "gravity" to make the eye bounce only on that one side. Possibly have a second Peggy array with amber lights for this effect.
  
• When the hazard lights are on (four-ways), the "eye" moves to the middle, then splits and bounces on both sides, like above.
  
• When the High Beam (Brights) are on, the scanner pattern inverts (black "eye" on white background) - I realise that won't really help with visibility, the LEDs would add negligible light to the driving lights, but it'd look cool.

I know this would take a lot of complex wiring, and would end up being quite wasteful of that big, beautiful Peggy board. Is there some way the Peggy board could be redesigned to have just the control circuitry and some kind of header for the LED panel? That might also be an interesting way of making Peggy signage expandable vertically as well as horizontally - The LED board is reduced down to just the LEDs, with a header on the back, and the control board can be connected to that header either by a flexible flat cable, or a header on it's front. Then you could mount the boards together without the gap where the control board goes, the control boards either being moved away from the array completely, or would slip behind them:

Just a thought. Comments? Ideas? Flames?

It's clever and ambitious, but possible. Here are a few things to keep in mind:

• The type of lights that can be placed on cars are typically regulated by law, so you might want to look into what kinds of lights *can* legally be displayed on your vehicle.
• The Peggy can run on on 4.5 - 5 V, but can't run directly on 10-15 V DC. You should be able to use a standard regulator like a 7805 (rated for 1 A+) to do the job.
• If you do this, use a Peggy 2LE, not the Peggy 2-- it's a smaller board, but functionally equivalent. So it's generally a better choice when routing all the wires off-board (it was actually designed partly so that people wouldn't keep using the giant board for off-board projects).
• The Peggy is a low-power display, generally intended for "indoor" brightness levels, whereas most automotive lighting is crazy bright (and very high power by comparison). As you note, "the LEDs would add negligible light to the driving lights." But yes, they could look cool.