There is fabric with "adult" cars on it, then you could get some matching fabric. Keep in mind there is fabric with tools on it too. We all know they have to work on them. YOu can also put in some "blank squars" and use a permanent maker to personalize it or name his car (s) he likes..his favorites. And you could buy it in colors he likes the best. Good luck. Like to see what you finally come up with.