RoboHash, the source code for the site RoboHash.org
OK, I'll admit I'm a crappy programmer.
Compounding this, I wrote this code initially to be internal-only. It's ugly, and could be a LOT nicer.
Sorry about that.

What it basically does is copy/paste the various robot pictures, using bits from the SHA hash.
It's not perfect, and not entirely secure, but it gives a good gut-check to "Hey, this sha is wrong"

The RoboHash images are available under the CC-BY-3.0 license.
Set 1 artwork created by Zikri Kader
Set 2 artwork created by Hrvoje Novakovic.
Set 3 artwork created by Julian Peter Arias.

The Python Code is available under the MIT/X license

Copyright (c) 2011, Colin Davis

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.