How to get a Blue/Purple/Green name? Just curious...

Hiya :) As the title suggests, I have noticed how some people on the Boards have different coloured names. Aside from the obvious Red (which belong to Riot employees), how did they manage to get the Blue/Purple/Green names? I'm *not* saying I deserve this, just interested in seeing what it takes. Might make it a goal of mine.\ Thanks :)
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