I personally think that it would look cool on ANY color car.
I was lucky enough in January to have the opportunity to see one of the pre production cars in Detroit before the Auto Show. I looked at the door really close and was thinking that it would be really neat to have. I opened the door to look at how it was attached to the quarter panel and noticed it was plastic and not metal.
Now before anyone jumps on me about it, I realize that molding in plastic is quicker, easier and cheaper than machining aluminum when prototyping. I was just surprised to open the door and find it plastic instead of metal. This one was attached to the fasteners that held the fill tube to the quarter panel and would be easy to transfer if the dimensions are the same between the coupe and convert.