ChatExtras

With a simple command, add colours to everything you say until you change colour or reset. Also has a random colour feature, where your text comes up a random colour whenever you chat.
Current commands are:

• /colour <hex digit>: Set that colour to prefix everything you say until you change again or reset. (Permission: chatextras.colour.simple)
  
• /colour reset: resets your chat colour to the default. (Permission: chatextras.colour.reset)
  
• /colour <random | rand | r>: Sets your chat to a random colour each time you chat. (Permission: chatextras.colour.random)
  
• /nick: Sets your display name (/unnick to reset)
  
• /name: Overrides mChat and sets all of what comes before your chat message (/unname to reset)
  
• Permissions: http://pastebin.com/0Gxy8DGz