[TKCR]

Well what I did was a lot of research and got lots of swatches for the headliner fabric and carpet. The seat was done with the same fabric and colors of the OEM seat. So with the seat, I used all the sample swatches and picked my carpet & headliner. I actually recovered my own headliner.
Then I moved onto the paint, I used Charcoal and painted all the plastic & metal pieces. I haven't had any issues with doing that. Also did the dash pad with the same paint.
The only thing I have changed since, is I bought and replaced the door panels, with the LMC panels. And the LMC panels were actually better than the one I had, so I'm happy with them.
My biggest challenge was the seatbelts. It was almost impossible to find a nice set of OEM charcoal belts, so I had to opt for aftermarket belts. But even those, I was able to find a pretty good match with the color. Don't get me wrong, it took a lot of time to finally find everything thing.

Check out my build thread, the link is there at the bottom of the page under the pics. You can see all the stages of my interior color change. It was maroon, but I changed it to charcoal. Here's just a before & after pic, but the build thread has more info & pics of the different areas of the truck.