Color Lists

When you blacklist an address, everything sent by that address is deleted.
When you whitelist an address, everything sent by that address is received.
What about greenlists? Or bluelists? Or redlists?
What do those lists do?
Would they still do those things if you were color-blind, or would they just be different shades of grey lists?
I, for one, haven’t read that Fifty Shades Of Grey book, but I’ve heard that it’s full of smut.
I don’t want to read smut, so I’d probably just blacklist all that stuff.
Even though I’m not actually color-blind.
But if I were, certainly.