Hmm...I've got red hair that I'm pretty happy with. I've never had any luck dyeing it, anyway. (Tried blue streaks once...they just looked brownish.)
I suppose bleaching it blonde would be cool, I always did like blonde hair. Especially light blonde...platinum...so light it's pretty much white. I love white hair. If I were dyeing it another color...well, black and brown are okay, but I'd go for something outrageous like shocking pink, lime green, pastel something or other, etc. What I've got is bright enough so I wouldn't necessarily go for neon orange and yellow. xD I dunno. Maybe rainbow. Without getting a clown effect...

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*~Proud Pegasister/brony~*