If simple wheel mods are not bleeding-edge enough for you, try Tire Tagz. "TireTagz uses complex electronic circuitry and high frequency LEDs to create patterns, images, words and even animations within the wheels of your car. Images appear to glow from the wheels of your car through a process known as "persistence of vision". As the unit rotates, the LEDs transmit thousands of light pulses every millisecond which in turn produces whatever image the user has programmed the unit to display." They also have pictures of semi-naked women on their site, if you care.