More to explore:
Game theme centerpieces
Gift-Themed Centerpiece Idea - Hostess with the Mostess®
Movie Themed Centerpiece
carnival theme centerpiece
Western Theme Centerpiece.
Candy Themed Centerpiece...could probably use cereal boxes and print off the graphics somehow...??
music themed centerpieces
Chocolate themed centerpiece - this is fugly, but I like the idea.
cute nautical theme centerpiece
Sheet music might look nice under the centerpiece if you go with a music vibe. Extra nice touch if you use a special song. Maybe even name the tables by song.
Carnival themed party centerpiece ideahttp://www.celebrations.com/content/creating-carnival-game-booths
Art themed centerpiece