Have you noticed the rather odd looking default Avatars that WordPress ships with? And who is Mystery Man?
Change that Avatar
You can add a default avatar of your choice. Add the following to you functions.php and upload the avatar to your images directory.
Alan, Great post. You should put a picture of the finished customized one, so everyone sees what it looks like. Also without coding one could just add a customized Avatar. Good tip.
Terry, Good suggestion.