You might be interested to know you can now get RGB LEDs in strip form complete with driver chips that allow individual control via some sort of serial interface to every LED - not cheap, but then 32 RGB leds aren't that cheap anyway - looks interesting and might be useful for this project:http://www.sparkfun.com/products/10312
If you're after a shield rather than soldering practice, there are lots of options for you. iTead has an 8x8 matrix color shield that is reasonably priced that should be more than capable of driving your project (http://iteadstudio.com/store/index.php?main_page=product_info&cPath=18&products_id=312&zenid=g9r1efj1n3iqt5pct82qam11k0). This shield will give you independent control for up to 64 individual RGB LEDs with PWM control.
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