Although the interiors are very roomy and comfy, I find all the dark gray boring. Needs a little PIZZAZ! So, as a first step, I have always died the seat stitching on my Challengers, including the arm rests on the doors. I simply use the 20 or so colored art pens, available at Wally's World (Walmart), in the art section. They are a latex paint so, fairly forgiving. All you need to do is pre-wet the small area you are working on, keep the small areas wet, apply generously, count to 15, and wipe off before it dries on the leather. The cotton stitching will always absorb the paint much more quickly that leather that is wet.