Identicons are those little icons that are used in forums and blogs to visually identify the persons posting in a discussion thread.
There are services such as Gravatar that allow you to use your own icon across websites, and some sites use a generative process to create identicons for those who don't have one.
Some time ago I designed generative identicons called stitchies, that combine high information density with the simplistic beauty of hungarian cross-stitch patterns. So here are a couple of stitchies generated from the periodic table of elements:
If every chemical element can have its own stitchy, so can you. Just enter a unique id (such as your email address) into this processing sketch. Your email address is automagically turned into a very much unique pattern — your personal stitchy identicon.
Generative identicons usually have a colorful geek chic, which can almost compete with that of rotating GIFs from the glorious days of the early web.
However their anarchic wild-wild-web style does not go along nicely with websites that follow the cult of the Web 2.0, and that's pretty much every professional website these days.
That's where stitchies come to the rescue: