Monster-avatars is a project mainly written in RUBY and SHELL, it's free.
Application to build custom avatars based upon a url. It is an example on seeing what image magick can do from the command line
Our local development databases do not have user avatar images. But that makes our forum pretty empty. So here is my avatar generator that will generate an avatar for a given id.
Started wanting to use a normal avatar type meme. But I can't draw, so defaulted to something others have drawn. Monsters.
There are a ton of great monster generators out there.
Here is where I got my start
Using the very pretty wp_monsterid/faces Not using their algorithm. so may need to tweak in the future