[RussEfarmer]

aTags is an excellent addon for making chat tags, provided you know how to use it and know how to make chat tags that don't look terrible. It requires no custom chatbox, so chat scrolling is not a problem.

Download. Colors are located in cl_chat_apple_tag.lua

Alternatively, Apple's Chat Tags is a lighter weight addon that provides consistent colors for the most part already configured (by me). I personally enjoy this one, since there isn't another menu to mess with in game, but it can only be edited via a file.