First Person description?

[ellenkushner]

Following the excellent leads of colleagues like Justine Larbalestier & kateelliott, I post a question about writing that someone recently sent me:

I am finishing a story for Friday and it's written in first person present tense. I just realized yesterday that my main character being an "I", I haven't described him physically at all. I know, it's the old same problem again, but how do you cope with that kind of problem? What do you actually do? Have him look into a mirror? Too obvious! Or something like: "You really are the way I imagined you." "Ah yes, what do you mean, my blond hair, big nose and small eyes?" I am just kidding, of course. :-)

Thanks so much for any quick tip.

My answer:
Why does it matter what the character looks like?

What's yours?