"My" car is a Honda Accord, in that sort of metallic sand color. Yep, about as nondescript as you can get. I try to park away from buildings both for the ease of parking and the fact that my car is likely to be the only one there!
My parents have a slightly newer version of the same car, in a slightly different color. Going out with them is fun: I can't find the car! Do you remember where we parked? That's not our car! Oh. I was looking for the other one.

My mom is a champion of forgetting where she parked. She once went up to an identical car with people in it and tried to unlock the door. I look at the stickers. (We've got a collection of window clings on both cars...)