Tri-Color LED Breakout Kit
This is a simple kit that allows the use of very large, very bright, 10mm red/green/blue LEDs. After assembling the kit, you can control the LEDs via the RGB pins. By pulse-width-modulating the pins any color can be created by mixing different amounts of red, green, and blue. Running from a 5V source, these LEDs are painfully bright.
This board is designed to run off 5V and put the max 80mA through each LED. Be sure to pay attention to the different resistor values and LED colors. Each is marked clearly on the PCB. You will need a coin cell battery or multimeter to briefly illuminate the LEDs to tell what color they are before assembly.