I'm a strong advocate that your avatar should compliment your alias, a bit like brand recognition in advertising. My user name was originally intended to be a play on the words "not bored", but I have since noticed that it could possibly be interpreted as a board belonging to a very speedy windsurfer. A chose my avatar, a picture of a 'reef knot', as it has nothing to do with either of these, although it maintains a relationship to the alias through distinctly nautical connotations.
....and if you believe that claptrap, you believe that Relli really dates the girls in his pictures