I've seen on the iPad that you can have pictures beside the bubbles inside an iMessage conversation, can you do that with the iPhone? If you're not sure what I'm referring to, here's a reference pic.
http://www.ijailbreak.com/wp-content/uploads/2011/06/features_imessage.png
http://www.ijailbreak.com/wp-content/uploads/2011/06/features_imessage.png