iCufflinks by Adafruit

“Adafruit” just released the iCufflinks, handsome, battery powered glowing cufflinks that pulse at the same speed as the Macbook’s “sleep” light. What’s really interesting is that the cufflinks are open source so you can download the circuit board files, the schematics, the CAD files, and the source code. Adafruit encourages other people to reprogram and hack the cufflinks to the pattern of their choice.

It seems that you could also switch out the color of the LED and mix it up a bit, but if you want to stay true to the Mac look, you should keep using that white LED.
BUY IT HERE