One good place to start for a wide variety of avatars is
http://www.heathersanimations.com/
If you want an avatar of a well known object e.g. saxophone, person etc, an image search in google usually gives good results. In google, enter the name of the object in the text field as usual, and click the image link above the text field. The results will mostly be real life photos.
Where can I find a decent avatar?
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