Originally posted by Dr Unne
Bleys might've added a text field to the main admin cp somewhere where you can change the color of the ranks. I remember he added fields for the colors of admins and mods at least, unless I'm remembering completely wrong. If you can't do it in the CP you have to change it in a couple places in the php files. showthread.php probably, maybe others. I don't remember. Bleys will know if you ask him.
functions.php and a table (setting) if you want it to be easily customizable. Maybe I'll get around to make it better someday, so that it automatically matches the number of categories.