My guess is 'Matt' Black from the Lexus LF-A.
Buy it, or have a friend buy, and then send it back and forth day by day.
Everytime you receive that car, or any car with a paint chip for that matter, you get a new paint chip.
Buy car, receive car and chip
Send car away, friend gets car and a chip.
He sends the car back, you get the car back AND a second chip.
Rinse and repeat.
I have done this, so I can confirm it works at least twice (only on my 2nd day of doing it, I assume it works indefinitely)
EDIT: And the all the cars here look terrific, well done, guys.