Interessting, I have been the only guy in my team who had the exact opposite colours. Green was production and red was testing (i didn't do any dev work, so). I guess that came from me being from produciton. But I should have payed more attention when working with other people on my machine, in hindsight... Luckily, nothing bad ever happened!
I liked a green screen (too much time spent with old terminals) and blue was ok to type on but not as nice . I went with the yellow (warning) and red (serious warning) because they are not very comfortable to type on and most people get the "alert" status given Star Trek.
