NTs as dark green
NFs as dark blue
SPs as a scarlet color
SJs as a yellow color
Is it that by its indefiniteness it shadows forth the heartless voids and immensities of the universe, and thus stabs us from behind with the thought of annihilation, when beholding the white depths of the milky way?
"How dreadful!" cried Lord Henry. "I can stand brute force, but brute reason is quite unbearable. There is something unfair about its use. It is hitting below the intellect." ~ Oscar Wilde - The picture of Dorian Gray
I guess if I have to rationalize it a bit, I think it's because I associate dark blue with the corporate world (and people in dark business suits) and somehow I associate the corporate world with Te. As for pale blue, to me this is the most cerebral of colours and Ti is the most cerebral of the functions. And the colour blue in general seems to suit NT because blue "feels" cool and detached.
These are my subjectively valid reasons (however crudely explained). Therefore, objection overruled!