My plan is to leave most of my 66 alone since the original paint is in great shape, however, the tailgate and rear bumper needed some assistance in order to match the overall shape of the rest of the truck.
So...I removed the nasty rear dealer-installed bumper, installed a painted contour bumper and added some red color back to the F.O.R.D letters. (I'm not a fan of fake patina, but I really felt like this truck needed the contrast of the red letters on the tailgate, so I made a small exception).
Here's the before and after.

Don
'66 Styleside Shortbed, I6, Original Paint Survivor
'54 Ford Mainline Tudor, 302/AOD, disc brakes
'54 Ford Club of America
http://www.1954Ford.com