Identicons and Visual Hashing
terrykwon.comNo mention of Robohash? Tch!
Wow, that looks really cool. From https://github.com/e1ven/Robohash it looks like there are dozens of components (mouth, nose, etc.) that can be combinatorically assembled, each of which has been hand-drawn, which must've taken a great deal of work on the author's part!