Invadicons are 8-bit avatars that look kind of like Space Invaders.
This is an open-source clone of Gravatar's retro avatars, written in Python. Invadicons are served by a Flask app.
These are some of the invadicons you get when you hash 00000000000000000000000000000000 repeatedly.
Request an invadicon by passing an MD5 hash to the application. Invadicons are served as PNG or SVG files. The default format is PNG, and the default size is 100px by 100px.
Optionally specify the .png suffix, or a size in pixels.
http://invadicons.example.org/11ac68eee8398ae00e9f6b11b22f7efd
http://invadicons.example.org/11ac68eee8398ae00e9f6b11b22f7efd.png
http://invadicons.example.org/11ac68eee8398ae00e9f6b11b22f7efd?size=128
Specify the .svg suffix.
http://invadicons.example.org/11ac68eee8398ae00e9f6b11b22f7efd.svg