The RGBSaber project is an open source RGB Luxeon LED driver. The driver allows for PWM modulation of an RGB luxeon LED, allowing the color of the lightsaber blade to be adjusted to nearly any color in the RGB color spectrum. The controller is based on PIC18F2221 and is open source. Check schematic and source code on the link below.
RGBSaber: Luxeon RGB LED Light Saber – [Link]