I had this idea a while back - not sure if it's already out there or already in development - what do you think about TF2 characters and weapons being re-modelled as gritty, realistic versions? I know the comic feel is so fundamental to TF2, and that there are so many items (and maps) now it would take an eternity to redo all of them, but I still think it'd be amazing to see.
This made me think of it. The Pyro looks a lot less comical here.
Oh and yes I know about the other Team Fortress HL2 mod.