I had this idea in my head everyday when I was using The Original:
What would tf2 be like in the 90s?
Here's what I came up with:
Everything but the map would be 2D
Sound and class voices would be in a fizzy low quality
The class selection would be 2D animated shots of the classes
Upon (an in-game animated) death instead of the death cam, it would be a animated mugshot of the class that killed you (with him mocking you) with a non-vocal 16-bit jingle of this ------> http://wiki.teamfortress.com/w/images/3/3a/Your_team_lost.wav?t=20100625225925
(Same with dominations and self deaths instead the class will mock the class you've been playing or show a halarous scene of your class dying)
Apon winning it will show an animated scene of your team cheering and upon losing it will show the class you've been playing as being sad or angry etc...
The health bar would be a classic small animated mug shot (it would look beat up as your class takes damage)