Well, I strongly suggest that you download a picture editing program like PaintNET or Gimp and just make them yourself. Judging by my own experience this is a) much more satisfying and b) more likely to get you what you are looking for. Plus, it can be quite fun! Learning to work with these programs doesn’t really take much time either and, as with anything, skill comes with practice.
Here are two avatars anyway:
I made them rather hastily so don’t judge them too harshly ;p