An “identicon” is a small 9-block image generated using hashed data,
like that of an IP address to visually identify users quickly while
still preserving user privacy.
http://www.docuverse.com/blog/donpark/2007/01/18/visual-security-9-block-ip-identification
There seems to be a couple of variations for PHP, Python etc… is
there anything like this pre-packaged for Ruby on Rails? I have
looked and been unable to find anything.