You can use the images on your computer or the ones in this topic for your own Avatar if you like.
To set one these as your Avatar simply do this...
1) Right Click the image, choose 'Save Picture As', select your destination.
2) Go to your profile & choose to upload an Avatar from your computer.
3) Pickthe image you just downloaded to your computer.
Poof. Done. New Avatar. Congrats!
