If you are looking for a cool educational toy or a conversation piece for your coffee table, the do it yourself clock project from KrazyDad might be your next project. There are a number of sites on the net that provide plans for building your own clock.
"I decided a few weeks ago to build a wooden gear clock because I wanted to understand the clock mechanism better. There are a number of websites that offer plans for wooden gear clocks, but as someone with absolutely no woodworkng experience (band practice generally interferes with taking shop class), and no tools, I needed something that was ready to build. I found three sites that offer such kits: Jeff's wooden-gear-clocks.com, klockit.com and clockplans.com." - KrazyDad