Utilising an Arduino microcontroller, which can receive input from a variety of environmental sources in order to coordinate a certain program, MacLight utilises LEDs attached to the rear of the Mac monitor in order to project an aura of light based on the colour most prominent on screen. You can also use the program to project a single colour from the LEDs, in case you’re looking for a certain kind of ambience or atmosphere. While it’s hardly going to the most popular Mac peripheral, it’s certainly worth looking at if you’re looking for some extra atmosphere, and have some spare cash lying around.
Judging by the video, Adam Howard, the creator of this cool peripheral, has done an excellent job with making this look great for gaming and watching films, and I imagine that it hugely adds to the ambience of music visualisations. If you want to find out more about Adam Howard, you can get pretty much everything about him at Skatty.me, and if you want to get into contact with him, you can check out his Twitter.