I've had a lot of interest in printables from the Cars Party that I threw for my little boy. Here is a link to the post with pictures of the printables and party: http://paperperfectiononline.blogspot.com/2010/09/i-recently-hosted-cars-birthday-party.html
Unfortunately, I can't sell printable with trademarked images like the Disney Cars characters but I can sell printables that match the look and you can add actual Cars toys on the tables to enhance the decorations and give it a "Cars" feel.
Here are a some of the printables that I made for a race car party that I can sell. If you would like to purchase the printables or find out more details contact email@example.com
Here are a few travel games which make GREAT party favors for your guests. I print mine and laminate them and them stick them all in pencil bags with a dry erase marker or two so that they can be used over and over again. If you go to the link at the top of the post you can see examples of the finished games and how I presented them as party favors.