Avatars are tricky. You want something reasonably unique but meaningful to you.
I don't think I could ever do a card art avatar, because it's quite easy for me to pick the same art as somebody else. That would be confusing, and kind of defeat the purpose.
So being a Hipster that is Too Cool for the Popular Trend of using card art avatars, I picked a late 90's album that's dear to my heart. Seems fitting really. Not the most popular thing in the world, and hardcore board gamers aren't the biggest indie rock snobs, so no chance of avatar collision, right?
Nah, I've seen at least one other person with the same album art for their avatar regardless. Guess there's not much I can do.