The expedit is one of IKEA's most sold products which with a cheap price is defiantly worth it.
But the expedit is missing color, it is available in white or black but those are not colors, so I added some RGB automatically changing LEDs which I bought of Ebay at a great price (50 LEDs and resistors for $9.) Then I used some foam, baking paper (you can use tracing paper or opaque plexiglass, whatever floats you boat. I also used some hot glue a breadboard with a switch and some duct tape.
Step 1: Lets gather the materials
RGB LEDs (4 per expedit)
resistors (according to your LEDS)
Baking/ tracing paper
Hot glue gun
A bread board(optional)
You will need to be able to:
Use a hot glue gun
Be able to figure out which resistors you need
Have common sense incase of injuries (or burns from a hot glue gun)