Mood Lighting

This is a quick sketch I made up of a circuit to power and control a Red, Green and Blue LED with varying brightness. The processor at the core is an ATtiny2313 from Atmel. It will accept three numbers over a serial link and use that to set the brightness of the corresponding LED using PWM and 2N2222 signal transistors. The LEDs will be housed in a diffuser plastic to blend the colors and allow you to select a number of colors across the RGB palette based on some kind of numerical input like temperature, stock price, ambient noise level, etc. This circuit is more of a proof of concept idea to see if I can have the effect I want. It's not really suitable for powering/controlling multiple sets of lights away from the base station. Please comment and tell me what you think of the idea and the design and such. And I realize the design is probably flawed and needs more work, I whipped this up this afternoon on a whim, it is far from done.