Edible centerpieces can serve not only as decoration but as appetizers as well.
Large baskets of breads and/or muffins make great centerpieces.
Large baskets with fruit also work well.
Baskets with handles make for a nicer display. Dont forget to line the baskets with cloth before adding the food stuffs. Stuff the basket half full of newspaper, then lay your bread cloth inside.
When you add the baked goods, the baskets look very full.
Cheese boards with different cheeses, crackers, and apple slices or grapes make great centerpieces and can double as the appetizers.
You can also use 3 tier glass stands, and place chocolates or other bite sized goodies on the plates. Set them on mirrors or lame and surround with tea lights.