Sorry, I don't have any pictures of it, but....
When I was still driving around in a sports car and carrying a Glock, I took a Glock belt-slide holster and used some of the black, plastic license plate screws and some 1/4 inch thick rubber washers and just screwed the holster to the transmission tunnel.
It was black and blended well, and when I sold the car the black screws in the transmission tunnel were almost unnoticeable.
What I'm currently experimenting with now, is a Serpa holster and the new Serpa quick disconnect system that lets you move the holster from a belt, to a MOLLE vest, or wherever else you have the QC part attached.