I've noticed a continuing trend of people who modify the default avatar in some way. I think it started with somebody who added horns to it and went from there.
All I can really say about it is, good work starting a trend. I'm interested to see what others here come up with!
There's another thread about it.
Damnit, how'd I miss that! I could have sworn I'd checked the first page on the forum for any threads containing "avatar". I'm going to blame the forum software