Figure that since it is a hosting question site, and a lot of people use Linux for their OS, we'd be a Tux based avatar site.
The gallery plug-in for the site takes over being able to upload personal avatars - which I really don't mind as I have seen some inappropriate ones in the past by people.
So, there are (currently) 87 Tux avatar options for any users to select in addition to the default one.
These are some I had when I ran my Now Serving Linux website before I lost interest in helping out others after getting burned out by XF users demanding (not asking) to be helped.
Just a small sample.
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