CustomBanMessage
Download link is located at the bottom of the page

This plugin allows you to set a custom message that is displayed to a player when they are banned. The message is fully configurable in the config and this plugin is compatible with any banning system based on the Minecraft one (including Essentials). This is handy if you want players to know where they can appeal their ban or other information.

Screenshots
Here is what a permanent ban looks like:
Permanent Ban

Here is what a temporary ban looks like:
Temp Ban

Download
Download and more information is availabe at the link below:
http://dev.bukkit.org/bukkit-plugins/custombanmessage/