[binji]

Oops you're right, I should have mentioned that. Red works too, I just didn't want to write Blue/Red everwhere :)

[glhaynes]

In the spirit of the project I'm surprised you didn't pick "Red" because it's one fewer characters. :)

[northern-lights]

What about Yellow? If yes, you could shorted it as RBY which is more familiar to most old genners.