I just figured out I can load custom images onto my car radio. Check it out:
http://www.gamingenterprisesinc.com/temp/Sat_Radio1.jpg

And if I get tired of it, I can use:
http://www.gamingenterprisesinc.com/temp/Sat_Radio2.jpg

I couldn't take a good picture without it looking washed out, for some reason. They look a lot better in person.