Geek Clock plasmoid resembles the outlook of the real life geek clock. If you are using KDE version 4.3 or higher you can get it for free straight to your desktop.
It is GPL. Yes, you can get the source code. It is actually the same as for standard analog clock plasmoid, but with some minor tweaks and different images, of course.
Source code is here: geek-clock-plasmoid-1.0-src.tar.gz or on github.
Consider visiting plasmoid's kde-look page, there you may eventually find package for your distro. I can only provide you with:
Vitaliy Ivanov <email@example.com>
Weblog: wicharek.name (in Russian language)