MCBans, as far as I am aware, does not allow changing the colors, formatting, etc. of messages, unless you hack into the plugin.

Proposal: Add a Language file (or section in the config) where you can edit the colors, and content of messages.

I know this would be helpful to me, and I'm sure lots of other server administrators.

we actually do have language files, the the plugins/mcbans/languages/ folder, then you point the config setting "language:" to the files name.