I change avatars only for a good reason. I'm not bothered if people change their avatars, although I can say that some pictures are now very familiar to me and I identify the poster by it.
These are my previous avatars and what they represent to me:
The first one is called "The King of Mexico (as seen in 'Drawn Together')". I chose it in a haste because I wanted an avatar. I didn't like it very much because, although it represents me ethnically, I hate smoking and the smell of it... so I changed it after some few weeks.
The second one is titled "Flag of Hispanicity" ["
Bandera de la Hispanidad"] (sorry for the new word but I don't think that "Hispanidad" can be translated to English accurately). It was proposed in 1932 as a flag representing the common cultural inheritance that all Spanish-American countries share. The flag is not well know now because these days is not politically correct to feel proud of our Spanish culture.
I call the current avatar "A Templar Supplicant". I chose it before last Lent because I liked it and felt that way.