A floral centerpiece for Thanksgiving with fall colors could be a lush, vibrant arrangement featuring a mix of classic autumn hues. It could include deep red roses, bright orange marigolds, and golden yellow chrysanthemums, all accented with sprigs of greenery. Interspersed among the flowers could be small, decorative elements that evoke the spirit of the season, such as miniature pumpkins, pods, and berries. The entire arrangement perfectly captures the essence of Thanksgiving and the beauty of fall.