From late 2000 to 2006, I created and ran a personal blog (with some other "personal site"-ish features attached). Although the site existed strictly for me and some friends, with no client or user goals to design for (except maybe mild amusement), operating it over the years gave me a lot of freedom to practice and experiment with various web design ideas and technologies, and with some community building practices.
The website included my personal weblog, some often-humorous surveys, general information about me, random amusing quotes from me and my friends, and some personalization features for friends who visited regularly. It was a fun experience, but I eventually took the site offline, after graduate school and other responsibilities took priority over maintaining the website.