Pong Clock
I rescued an old Thinkpad ages ago and began a project to install it in a picture frame.
The original idea was to have it running things like Conway's Life and the Mandelbrot set. But then I saw the Pong Clock on a blog and decided to just do that instead.

I'm comfortable writing software, but the hardware assembly part always gives me pause, so this project was on hold for a long time. But I'm moving back to New Zealand in a few weeks so I wanted to finish it. A completed project takes up a tenth of the space of an uncompleted one!

Woot! Hack a Day liked it!
Yay! And Make!

You can grab just the Pong Clock screen-saver (.scr) file and/or the source code (Visual C++ 6.0, MFC as a dll) here.
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