At least half the avatars I've seen have either been Mona Lisa portrait with the face replaced or the standard github avatar XD
Don't Follow The Crowd Just Because Everyone Is In There. *cough* everyone is following the Mona Lisa and SOFE profile pic crowd including you
surprise that rarely get mentioned, i need to put something that gets more people attention then anyhow that dose not answer toward OP's question
Lmaooo, you should have seen the forums a month ago or so. Literally EVERYONE had the @SOFe avatar. Blame @Primus