DIY Disney Cars Centerpiece. I bought a round green foam at dollar tree and used as the base as well as those cars on it and the trophy. I also bought the vase at dollar tree and the red metallic Pom poms which I cut and stuffed them in there. The foam from the flag, lightning bolt and lightning McQueen I purchased at Michaels. I made the lightning McQueen with the help of a template I found on Pinterest. The plain balloons were also purchased at dollar tree but the Cars one at Part City.