Forget generic images on the hubcabs of taxi cabs as advertising... there's something even better now. The "pimp star" from Dub Wheels is a new wheel with LEDs that allows you to load images on your wheels as you drive down the street. Learn more about it at Customwheel.com. According to the site:
"With the PimpStar's built-in full color LED lights, microprocessor and wireless modem, you can display virtually any image, including text, graphics, logos, and even digital photos!"
Make sure you check out this video of them in action. Pretty impressive, but they'll cost you.