On the last several trucks I've done, I have painted the metal areas with low-gloss paint in a similar color to the plastic trim color. I have never liked the Black with Red trim, White with Blue trim, Yellow with Tan trim, ect. ect. Some colors aren't quite so bad...the Blue with Blue, the muck Green with equally ugly Green interior, Brown with Tan ect.
To each his own...if you want to sit in a "bruise" so be it
Here's one of mine. The seat is faded a bit, but the camera made it come out really different for some reason

