Two excellent Guitar Hero hardware hacks

I came across two very cool Guitar Hero hacks on Instructables this morning.

The first, by user fungus amungus, shows how to put LEDs into the fret buttons of your GH guitar. The second, by bofthem, shows how to actually make the replacement fret buttons to work with fungus amungus' LEDs.

Here is a video of the LEDs in action.

I've got a lot of vacation time over the holidays. I may have to give these a shot on my old PS2 guitar.