I somehow forgot to brag about my 8×8 RGB Led coffee table that was in development for quite some time.
This video shows the table connected to PixelInvaders.
And this one running Adafruit’s FFT analyser. (with microphone attachment)
Earlier version was made using a 8×8 matrix configuration. Of course having PWM on leds in this configuration was just too much for an Arduino (probably the code wasn’t optimised enough either)
Earliest version, using just code running on the Arduino.