Animated avatars.
NO WAIT DON'T POST YET! I'm not done!
I can understand that you don't want some whole clip from a show of a guy chopping off heads in GIF form, but what about something simple? You know, like, for example, my current avatar, but the guy's blinking every now and then. Something like...

^That^
It's very simple, It doesn't draw attention to itself, and it's four frames long. That wouldn't be that much to put as an avatar, would it?
Go ahead. Say anything. I'm used to having my self-esteem lowered.

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DNF #1
Duke 3D #1

and will again when QuakeCon is finished, and I've never had any trouble, so I think that just a dude blinking will go without being penalised.

