Like Rinne said, it depends on the server.
But pretty much you have to be a donor on that server to do colored chat and colored signs. The donor rank for which it can be done is different on each server that it's allowed on.
I asked about greeting in skygrid, and anyone is allowed to do colored greetings, it's just a different command from normal colored chat. What all the commands are, I'm not sure. I was told &g was lime green and &G was dark green.
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