I just came across the technology in a tech article.
Here is the summary of the article-
A new technology using a "paramagnetic" paint coating will allow owners to change their vehicles paint colour at the turn of a dial.
It works by sending a current through a special polymer applied to the vehicle before painting. The polymer contains particles of "paramagnetic" iron oxide. With the application of an electrical current , the distance between the oxide's crystals is adjusted, affecting their level of light reflection and therefore our colour perception.
The first commercial applications are expected on the market as early as 2010 (most likely applied to a Nissan)
^^^^^ Thats exactly why i see this new technology being a problem. You could just go pull over and park with a whole bunch of cars and have your car go back to nuetral which is white. It is a pretty cool idea though.