looks like your background will need to be made of three parts: a floor, a wall and a platform for the car. you can easyly make the platform with shape 3D, and it might work without a wall.
as for the actual floor, ther's too many possibilities. i'm thinking something with tyles and some marble/stone texture, but then again you could have something else in mind. try searching the tutorials for some textures, maby that'll help.