I like the idea of identicons... icons algorithmically created for each individual. But, all of the ones I've seen were very squarish, which didn't appeal to me very well. So, I wanted to take a crack at creating a circular identicon (hence 'CircIdenticon'). Give this a try! Use an email, username, your real name, whatever you wish, and this page will provide a unique, circular image based on that text, reproducable each time you type the same text.
If you'd like a little more information, I've made this available on github.com.