This is a very easy project.
I won't go into too much detail how each part works, because I have written some information on my blog.
But you should be able to make it work with the information given on this instructable.
Here is the result
The RGB LEDs came as a strip, but I want them to be separated further, so I soldered wires in between. I also use hot glue to strengthen the soldering points.
you could buy led strips that have long cables, or you can just use this out of the box, it's up to you.
I am using 25 LEDs.