If symmetry is your style, here's a look for you. Start with a knockout mirror centered above the fireplace. Flank the mirror with a pair of tall bronze candlesticks.
Alan added color with candles, wheatgrass, and pretty paper. The combination is a fresh way to bring in the outdoors. Line small boxes filled with wheatgrass along the center of the mantel. Wrap paper around each box for an additional burst of green.