My personal favorite (because I made it 
) is: http://wiki.battlemaster.org/wiki/Template:Message2
Instructions are right on that page, included copy/paste-able code. It also uses color coding to simulate the in-game colors for the various message types.
This template posts everything in (boring) shades of gray: http://wiki.battlemaster.org/wiki/Template:Message
Someone did one similar to Message2 that colors the entire message box, not just the header. I don't remember what it was called, and a quick search didn't find it.
Uhhhh... You made Template:Message, which I based myself off to make Template:Message2 myself. You made the nice help page though I believe.
