Well, as of this post, I'm not using my "standard"
Mr. Blonde avatar, though I may switch back to that one in not too long a time.
I switched over to this current one, of Graham Jones, (from
Castlevania: Aria of Sorrow) shortly before the release of
Oblivion. Although both are of video game villians, I liked this one, and at the time, I was playing a "villian" in a forum game, (to be more specific, Steerpike's "dynamic" on the official TES forums) and decided this one was more fitting.
However, even without that merit, it still fulfils the criteria I demand for my "standard" avatars: it's a video game character, and not immediately recognizable. (at least to most people) I have a number of avatars I've not used yet, or only used for a short duration, including my Halloween and Christmas avatars. I'm suprised that I haven't heard any posts about those, but perhaps they don't merit questions.