We needed a build server to test new admissions to our version control
system, and all the available open source alternatives at the time did
not suit my colleague, so he built one himself. He enlisted me for the
logo and web design and front-end implementation (in Django).
The final version had coloring on the status of each project so it was clear
what succeeded and failed. On of the fun bits of this project was creating
animated gifs to indicate when the build server was busy running
something and when is was not.