There are many people who want to see their Private Message module in Drupal to look like Facebook - i.e. with user pictures. Pictures make messages more "personal" and "closer" than e-mails. I made it work in D5 and D6 by putting functions into template.php, but for D7 I can't find any such snippet that would work for D7.
I've written more about this here http://drupal.org/node/1549540 There's already much of the snippet there, but the DB query returns an error.
Can someone please help write a lasting solution for drupal user in D7?