Thanks to LED technology, some phones can now light up like Christmas trees. Some people like it, others hate it. We think that a light-based ringtone is actually better than a sound-based one, since it's mostly quiet and easy to spot if you leave your cell phone in your field of view.
KDDI and Kyocera have announced the W64SA, a phone which will offer some form of color therapy thanks to its embedded LEDs. We don't really know if this will be that effective, but the phone's color therapy lights will shine through its backside,thanks to the use of transparent plastics.