When you register, you need to create an avatar for your user. Most sites do this:

It’s a little monotonous. Fortunately, Gravatar gives us better play styles, such as:

Only the HTTP request http://www.gravatar.com/avatar/ {hash}? S = 256 & d = identicon, including:

  • hash: Generates a random number to fill
  • s: size, in pixels
  • d: Style, currently available identicon, MonsterID, Wavatar, retro, RoboHash, etc

For details, see the Gravatar document Image Request.