It looks really good! If you were looking to do anything else to the car, you could get a C.F. trunk, paint it to match your color, but leave the area around the faux gas cap exposed so that it looks blacked-out. Basically what you have now, but it would tie the scheme on the rear and front of the car together.
Dark Highland Green to be exact. Always loved the color and Steve McQueen is pretty much my freakin hero so....