You can't go wrong with a glass vase full of real flowers.

For everyday and given your more traditional art and side board, perhaps a set of three (always more pleasing to the eye) mercury glass jars. When you are using the table for meals or entertaining, these can be placed on the side board, as it's nice to accessorize there as well.

To go with your theme on your buffet, I suggest high quality plastic fruit in any of these configurations. I also like the candle in hurricane vases. You can make these by getting consignment store glass candlesticks and a glass vase, glue, and you are good to go.

Colorful bottles in varying heights. As Maureen suggested a set of three. You could put them on a round tray or set right on the table. You can add single flowers to each on special occasions.

I'd like a vase or something with a sculptural quality. No flowers in the vase. Repeating the color of the chandelier.