Matt Smith
Karen Gillan
John Simm
John Barrowman
Colin Baker?
Nicholas Briggs
Andrew Garfield (aha. Like its going to happen with AMS, but heck, I can dream)
Billie Piper
Noel Clarke
Oh. And Alex Kingston
Matt Smith, John Simm and John Barrowman would make excellent double photos with David Tennant. Especially Matt Smith, with them both in costume (again, unlikely, but I can hope)