Hey, thanks for your answer!
Do you mean these here: NeoPixel 5050 RGB LED with Integrated Driver Chip - 10 Pack : ID 1655 : $4.50 : Adafruit Industries, Unique & fun DIY electronics and kits
I'm afraid, the Smart NeoPixel are too expensive for me :-/
Btw: Really nice project you have there, well done! This reminds me a bit on what I try to do. It's a board-game which I do as a school project and in my case, I will have one button which should set randomly the color of each LED.