Some of the people weighing on on their favourite Ford Shelby GT350R paint jobs sound like they wish they were assigned a different colour but would rather not pay to change it. 

I seem to recall some time ago there was a post talking about re-randomizing the colour of the car given for challenges. My best recollection is that it involved restoring a save from before the challenge and then opening up the challenge again. Does anyone know if this worked and if it still works?

If I could go back, I'd try to get the blue Shelby instead of the white one I received.