For a lighted centerpiece, put a flameless candle at the center and surround with your choice of decor. Or, fill a vase with water and top with these floating water candles (safely fueled by vegetable oil).
You can also surround your vase centerpiece with led lit tea lights, personalized candles, or wedding favors. Wedding favor ideas: plantable seed packets, chocolate coins, personalized candy bars, the previously mentioned rose petals, or cookies.
You can get more ideas for wedding centerpieces from the photos here.