haha pink isn't really my kinda colour - although bint says my red and white hat looks pink 
green could be cool too. a girl at college dyed her hair green for st patricks day once. i think blue would suit me more tho. how long does it last?
Will depend on how often you wash it too.
I don't recall any-more what lasts longer, blue or pink. One of the two colours is not that long-lasting.
My brother died his hair, beard and moustache blue with crepe paper once. He thought it would wash out quickly.
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He thoroughly shaved himself after a few days.