/etc/colorizerc, $HOME/.colorizerc
These files are the default configuration files for colorize, and are parsed by ccze for the sake of full compatibility.
/etc/cczerc, $HOME/.cczerc
This two are the main configuration files, in which one can change the colors used by the program to his liking. See the comments in the beginning of /etc/cczerc for a description on the files' structure.