At Eric's behest, I'm releasing the code that I used to generate the ABC colored graphs that I posted about earlier. It allows for quick and dirty (I prefer the term "clean") graphs through Graphviz's dot language.
It has other bells and whistles, when a plain graph just won't do, but the emphasis is on simplicity and getting things done. Best of all, it is only 65 lines long.
Code after the cut...