Here are a few pics of a new RGB LED board I built. It is still a work in progress and the pics don't do it justice.
This latest version can drive multiple RGB LED's (as much as your power supply can handle). There are now 3 dual digit colored coded LED displays that show the color. The board can produce over 200,000 colors (64^3). There are 2 modes. Mode 1 allows you to specify a color using the 3 potentiometers. Mode 2 fades through the different colors and the potentiometers controls the speed. I'm still waiting for the color matching knobs and the mode toggle switch to arrive.