Here's a fun little weekend project.
At one point I building a turnkey website hosting service, and as part of that process I also set up an FAQ where users can find answers.
There are several free FAQ themes for WP, but they all looked awful. So in addition to answering all the questions, I also had to modify the CSS and layout so that the site actually looked nice.
It was a small project, but a fun one because it was such a change of pace.