This is the video demonstration of what the final product will look like. This could also easily be used to control an arduino robot or anything at all that the arduino is running!
if the video won't play here is the link http://www.youtube.com/watch?v=hqgcAuNUyR0
Step 1: How To Tutorial
if the vid doesn't open here is the url http://www.youtube.com/watch?v=s9etKD2y-Zk
Step 3: Wiring for LEDs
You have the wiring from the arduino for each color connected to the positive side of the led and the grounding wire from the arduino is grounding all of them. They are running in parallel to each other and in series with a resistor.