text: Q:
  
  How are Stack Overflow's default profile pictures generated?
  
  Anyone else wonder how the default profile pics for Stack Overflow are generated? It must be generated dynamically as it shows random patterns. Can anyone show an implementation of the algorithm in Java? 
  
  A:
  
  The generated profile picture is called a gravatar, read about in the linked answer. And for generating it in Java, as is suggested here, you could take a look at jgravatar.
  
  