Instructables member bpwagner made this good looking clock with an arduino and some laser cut gear he designed himself:
|"I decided to build a gear clock after seeing something like what I made in a friends office and after playing with the gear renderer in Inkscape. This instructable hopefully will show you how to make what I made and also teach you a little about the design process involved when working with a laser cutter."|
For schematics, code for the arduino and more details follow the instructable.