Come on, let's have some fun!
Do I need to say more ?
Apparently I do!
If a user has a custom avatar, such as me, then nothing will change.
If a user doesn't have a custom avatar then an unique one will be displayed based on the md5 of the user's email. But, there are several styles you can choose from. The one we use is called
identicon; it's the most professional of all the ones available. But there are more themes, such as
monsterid (see example above).
They as well are for all intent and purposes unique, different for each email. Let's play around with the hash and get more examples: