From Alfonso Bozzelli:
Persona for iPhone and iPod Touch let you build avatar of your contacts and friends. You can choose hundreds of face parts in different colors and build cute characters in a minute. Use it to give a face to your contacts or in any way you like.
Design your avatar and export it on your personal computer or iPhone / iPod Touch Photo Library.
Assign your avatar directly to your Address Book's contacts.
Use your avatar in forums, social networks, instant messenger and blogs
You can't build your avatar? What sort of face parts you need? Go to Support page and send your request!