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"

CC BY 3.0 on the Images, BSD on the code.
-CPD