On Face Your Manga, you can create your own custom manga avatar of yourself! Here’s mine.
They have a limited amount of options, but you can come really close to what you look like. I’m a sucker for these silly things! Another one I found, which was advertised on the site is Platrium, which is in beta. Try out their fun anime avatar makers.
I love doll makers, so if you know of any other doll/avatar making sites, share it here in comments!