Here is a digital clock I made with a SparkFun Pro Micro Arduino, a ChronoDot RTC and some LPD8806 ribbon LEDs. http://www.craigandheather.net/celeledclock.html
This clock turned out great and it is a real attention getter. At night it projects a light show onto the wall behind it that is always changing colors and is very abstract.
Why not build one for yourself ?