Place burning candles by mirrors to reflect their beauty and light.  This is an effective way to make it look like you have twice the amount of candles.  This adds more beautiful glowing light that reflects out into your room and also adds a beautiful sense of depth to your decor.  

When I have guests over, I like to burn a candle on the counter in front of a big mirror we have in our powder room.  It always looks like there are two beautiful candles burning.  The best part is, I only paid for one!  

Many candle accessories are designed with mirrors to reflect the light because the designers know this creates such a beautiful look.  Some candle accessories designed with mirrors include pillar plates and candle sconces.