Arduino RGB LED clock via Hacked Gadgets.

180 RGB LEDs driven by TLC5925 constant current LED drivers
each LED addressed separately (12x TLC5925 with 16 outputs each).
each colour adressed individually
4x 7 segment LED display
Atmega328P as MCU
DS1307 real time clock
Photoresistor (for adjusting brightness)
And DHT11 for temperature and humidity
Backup battery for clock
5V DC (eg USB)