Slightly tongue-in-cheek this one but written in good faith...
I am a competent user of LaTeX and use it with Eclipse as IDE, MacTexlive as install, and XeTeX as engine to author my PhD.
However, there are times when I like to procrastinate and love LaTeX as an end in itself not just as a means to an end. What would you recommend as a good way of procrastinating whilst usefully extending my capabilities and abilities to use LaTeX?
In the past SVN, biber and beamer have served to distract me from my thesis. Any more potentially fruitful areas?