Just because a cable lights up, that doesn't necessarily mean it's smart. To wit, Evergreen Japan has developed one that "dances to the rhythm of the music you are listening to," Gearfuse says, but doesn't do much of anything else except maybe keep you from getting run over by a car at night. They also require a clunky battery box to provide power, diluting whatever cool factor they manage to muster--which probably isn't a huge loss.
How to select the optimal screen size
Choosing the right screen size for your new TV may be even more important than any other feature. Eric Franklin shows a simple way to do it.