Want a simple light show in your room? Here’s an Instructable on how to build your own. The Color organ is all analog and built from only transistors, resistors, capacitors, and of course LEDs:

Audio source can be any “line level” output from audio equipment, or headphone output from computer sound cards and iPod/MP3 players. If you want to listen to the music while using Color Organ Triple Deluxe II, you might need a splitter cable.

Connect Color Organ Triple Deluxe II to your audio source of choice, and give it a play. I found music with good amount of beats to give best results. Adjust the potentiometer (sensitivity level) according to the sound level.

Via Hacked Gadgets.