My avatar's simply cropped from a picture I made. While the picture itself was just a random idea I had, I liked how it turned out enough to want to use it as an avatar. :x I guess it helps that typhlosion's one of my favorite pokemon, too.
Edit: Of course, if you look at this post now it's obviously not a typhlosion of any sort. Now it's Haku from Spirited Away - I watched the movie again for the first time in a while, and had forgotten how much I liked it. Thus, new avatar.