Model Changes When Healh Bar Drops...

The title I would imagine would give you a good idea of what this is about. The idea is when you take a certain amount of damage or when you're heath bar begins to drop the model has certain change and will look battered and beaten rather than just die looking like $100 bucks, rather they would have cuts,and blood and mortal wounds on them. This would add a little more immersion to the game and the tiny/big features like this could be very cool.