I've had the pleasure of decorating the gorgeous mantle in the GW Hotel Ballroom several times, and every time is different. For my wedding I opted for and arrangement to flank either side of the mirror, and several low cylinders with roses and floating candles in the middle.
I was able to "test drive" a new product available to me for the wedding. LED submersible light strands. The strands are flexible and perfect in this application.
(All photographs courtesy of Julie Napear Photography. A big thank you to the other vendors: Flowers by Snellings, George Washington Hotel, Stephanie Novak Artistry, Frosted Crumbs Bakery)