There's a few places that will retrim the headlining - problably the only way to change the colour.
If you mean doing all the A Pillar and B Pillar plastics? Then I think the answer is to get them sprayed.
There's a few places that are doing the spraying, but watch out for how much they charge. If I ever do mine I'm going to find a local sprayer.
You might make the cab pretty dark, there some pictures on Customvanz website that will show what I mean.