Lighthouse Nautical Centerpiece (12" X 5") Cardboard. Lighthouse Nautical Centerpiece. From seaside parties and beach bashes to nautical-themed weddings and events, this lighthouse centerpiece is a stylish way to guide guests to their tables! It's red, white and blue motif makes it a unique 4th of July decoration, too! Cardboard. 12" x 5" Simple assembly required.