Adafruit sells a really cool "slow flashing LED" which was used for this mod - biased with a 330 Ohm resistor off the 9v - 7805 regulator's Input lead. Thin wires were carefully threaded thru the small hole beneath heatsink.
LED and thin wires are stuck on acrylic with a dab of hot glue and routed near the back corner beneath the Clock.
Lights up the whole room in a pulsing glow of colors… (add a pot to control brightness!)
Can't believe how cool it turned out... that’s how I pimped MY IceClock…