Microsoft made available one more theme for Windows 7 named as Classic American Road Trip. You can download the themepack and can customize on your own to make pictures shuffle or change the time to change picture.
Grab your cat-eye sunglasses and jump in the station wagon! Summer is here and it’s time for an all-American road trip. This free theme for Windows 7 takes you back to the age of vintage cars, Route 66, and cheap gasoline. Classic American scenery provided. Bring your own lemonade and picnic basket
You can check other themepack here.
See how to create your own Windows 7 theme pack.