It’s not really the same kind of mod that most people would associate with the work “mod” as they only changed the LED in the Xbox 360 controller from the Xbox 360 green that most people dislike to a more blue/green light which looks much better in my opinion.
From Llamma’s Adventues in Xbox 360:
Adding four 3mm blue led’s rigged up inside the 360 button gives it a beautiful glow.. so much more sexy than it was..mmmmm! The Llamma doesnt stop there though folks, cuz at Llamma it’s always ON! Changing the green port/status led’s to blue is a must! This proved to be a two person job on this one because they are freakin tiny surface mount led’s.
It would have been nicer if they had changed a few more things than just the main LED’s in the controller.