[jpetersen]

Each color style has its own bg.gif image inside the color folder. If you want the red header to have a car, change the red/images/bg.gif to have a car, and then edit or leave the blue/images/bg.gif AND the /images/bg.gif to be another image. Since blue is the default for the Blue theme, you need to change it both places, unless you want it different depending on your wishes.