Thanks for the comment on the last post, Darvey. Per the comment, this problem space is well occupied by gitfiti, a python library for putting graffitti into your commit history, ala:
Nice work Eric Romano. Now I have Super Mario music stuck in my head… .
Smathermather's Weblog 
No problemo! I was only lucky to recall it from a Hacker News post (which is, appropriately, where I discovered your blog as well).