Candles are so common that typically every bride includes them in her wedding. The trick is to figure out how you can make your candles or candle holders unique enough to stand out from the rest.
Usually, the most simple ideas tend to be the most unique and unthought-of.
Turn a wine glass upside down and it instantly becomes a candle holder. Put them in sets of 3 for a fuller look. You can even place a flower under the cup portion of the glass. You could also put a love quote, keepsake, memories, pictures, etc.
The possibilities are endless!