I know that I am not the first person who has suggested this, I simply cannot be... First off, your app is damn near perfect. I really do like it. Secondly, I would think it would be a nice option to show the contact avatar's next to their message in the thread, and I think that it would be cool to implement a custom led color/flash frequency. Like if your girlfriend texted you, you could have it flash faster than your sister or something.