Well, of course there are default ones, but you have most probably seen them. They don't have to be exactly fitting, other sizes can be clear too.
Many people just find theirs randomly. One thing you could do is find an image you want, then save, and upload to image shack (or another upload site) as avatar (or appropriate) size. This may or may not change the images clarity and resolution.
See how you go, and if none of that works - just let me know what you may want an avatar of, and I will see what I can find.
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