Two sites not included on those postsare Mr. Picasohead. where you can use Picaso-like gestures to create images,
photo credit: "Moranga" by Fada Moranga
and Ultimate Flash Face, which works the way (I imagine) an identikit might work.
screen shot from FlashFace
Another site you might want to use is FaceYourManga. Mouse over the choices on the left, and build your face. Save it with a screen shot, if you don't want to give the site your email address.
screen shot of FaceYourManga