so a while back Health bars for npcs and mounds and such were suggested, this now doesnt seem a great idea and more unrealistic, but what i found that seems pretty cool is seeing the health loss your dealing to something.
look at the addon here: http://steamcommunity.com/sharedfiles/filedetails/?id=110871780&searchtext=
Now i think that would be cool, i was thinking you guys could probably make your own version better or more PNRP styled.
Also suggest by jamie, you could allow this function to be togglable for players, so its default = off but you can put it on if you wish, i know id use it.