I saw something like this before, only it was a car exhaust accessory.
Whereas the "stack gas" creates electricity through this "peltier junction" by the accumulation of heat to light LEDs "ice blue" that surrounds the "bezel"
Good idea none the less, Thinkgeek is an excellent place to buy from..$15.
I would expect this sort of thing to come by quite frequently as technology advances...perhaps built in LED screen that appears and disappears on the "eyeglass wafer" on demand.
