I hope these are photos of cars that Ginger has actually done, otherwise they don't mean anything.
One of the questions people may ask when receiving the card is whether those cars were ones he actually did. If he didn't do them, he will have to backpedal and say, no, but I work on cars like that. Not good, IMO.
The white cars don't really show the quality of shine that black cars would. If you want to impress people with the quality of your work, it should be of a black car you did.
I suppose white cars save ink on the cards.
Part of me thinks that a picture of a Ferrari may alienate people who can't afford a Ferrari, and anyone who owns a Ferrari probably isn't going to let someone work on their Ferrari that they don't know, just because they gave them a card with a Ferrari on it.
I could be mistaken on this.