The PulseVU2 makes LEDs connected to it Pulse to gameplay sounds using HDMI input, with multiple modes you can even connect Remote or Music LEDs to it for it to blink multiple colors, then change modes to use remote LEDs.
The Video above briefly shows the Xbox 360 booting up snd how the LEDs Pulse to the startup sound.
(Link for installation not available yet)
Click HERE for how to install this product.
Xbox 360 Phat, Slim, ESlim.
Untested with ESlim or Xbox One.