Hmm, I like the idea of being a snowcone... except that I'd melt in any temperature above freezing. Plus, I'd rather be cherry than rainbow.
Writer it is, then, for roughly the same reasons that Gavin mentioned. (I call dibs on the audiobook loophole!)
Seriously, though, I need some manner of self-expression, and I don't have the dexterity for artwork. Nor do I find music sufficient to convey the ideas I have -- beautiful and fascinating though music may be, four-minute lyrics are too short and instrumentals too abstract to say what I'd really like to say. I certainly enjoy reading, and it's definitely vital for any community, but I personally have to be able to write.