Inspired by here:
http://www.tfproject.org/tfp/showthread.php?t=279.
Use a single sentence to describe yourself. Make this a day-to-day thing is you wish since we all change mentally, physically, emotionally, etc. But let's not limit this to "I am tall" or "happy" or "horny." We are, after all, in Tilted Literature! Let's make some poetry!
And for my first sentence, I'll take a line from my at-the-time current signature:
I forever will be a wandering spirit collecting not only stories from the far and trinkets to vivify the past, but also elements of myself.