Lollipop sticks and clear circle sticks for the tractor wheels. You can put little candies on the chair.

Digital scrapbook kit: [url=http://www.oscraps.com/shop/product.php?productid=24543]Recharged[/url] by [url=http://www.danielleyoungdesigns.com/blog/]Danielle Young Designs[/url]
Template: [url=http://www.afterfivedesigns.com/shoppe/product.php?productid=1641&cat=0&page=1]Bumper Car[/url] by Designs by Sunghee

More photos and tutorial:
http://www.creativityinprogress.com/blog/recharged-tractor/