You pick your color which is free and THEN, pick the wrap. The color under the wrap is whatever color you select.
Is this a guess? I don't see any way to tell from the configurator.
When I tested this I selected "green" as a base color, and "purple" as a wrap color.
The selection of "green" disappears and selection moves to "Purple" No selection shows for green in anyway that I can see.
I then went to the Interior and looked at door jams and other places that would not typically be wrapped. (yeah, yeah... I know, its just a representation) No green peeking through.
When I selected "Color Coordinated" the interior changed to purple, not green. (hmmm... Interesting. Interior pieces are wrapped?)
-sterling