If you have a show car the here is an interesting project for you. You can build your own RGB LED Vehicle Turn Signals that StarfireMX developed for his Ford Mustang. The system used a number of Arduino based controllers and XBee wireless devices to allow remote control of the modes and color selections.
Starfiretech member in his Starfire’s Tech Blog says…..
“I would ultimately love to control them from my iPhone, and I am looking into ways of doing this use WiFi or even the cell network (I would incorporate more in to the system if I did this with cell connectivity) I tend to lean to the WiFi system it’s cheaper and draws less power. I might end up switching the system to a keyed power source so it is inactive when the car is off but for now this works.”