I like the avatars used on this site (drupal.stackexchange.com). They are "squares with some colors". Are they available and are they for free?

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Those are generated by Gravatar based on your email address and some salt.

You can e.g. follow this link: http://www.gravatar.com/avatar/5e17e2cc-3e32-473a-9e8c-20bdca6c138e?s=32&d=identicon&r=PG and generate the uuid part in a unique way for each user

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