Graduation Antenna Toppers (12 Pack) Foam Balls. Share your academic happiness as you drive with these fun foam car antenna balls! These cute graduation antenna toppers will surely add some color to your party venue. These foam car antenna balls with smiley heads can also be used as party favors, gifts and decoration too. Combine these with some of our themed graduation goody bags to create a perfect party favor for your guests. Find everything from graduation party decoration, tableware, party banner, graduation caps and hats, and accessories when you search for graduation. These 2 1/2" smiling yellow toppers make thoughtful gifts for all your senior classmates! 12 Pack.