Every year when Christmas arrives, i used to make my own version of 5 point star.I have a video tutorial on "Making of X-Mas Star" here. And i was little bored of doing same thing every year, by the time suddenly this idea came in my mind, yes its "RGB Star".
The Idea is controlling RGB led from smart phone via Bluetooth. I had chooses small ARM controller (LPC810) from NXP because of less pins also its available in DIP package.I used my own driver for generating 3 PWM signals for RGB led's. BT module is HC-05 commonly available in market, it establish the communication between my smart phone and the MCU.
Hardware side nothing much, just directly soldered MCU, regulator on small dot pcb board. For MCU and LED 3.3v supplies from the regulator.
And finally this setup was sit inside the Star with 5v power supply.
The other side , i had created an android application for picking up the color and send the RGB values to MCU over blue-tooth. The MCU process the value and generate the PWM values according to the RGB values.
Happy Christmas !