A simple layout like that would be lovely. I took inspiration from the Windows Phone messaging app. The small grey squares are where the profile pictures would be. Ignore the quotation marks, I was just playing about... The 'dot dot dot' s would bring up more information about that user (infact, pretend the dot dot dots arent there.. you could just tap the profile picture to bring up more info on the user)
The problem I have is where to put the user's name.. I wouldn't want it to go in the speech bubble.