Use BEESWAX candles! They are so good, and smell divine...(to me anyway) They are also healthier. Especially if you add some lavander oil, patchouli oil or Ylang Ylang oil to the base. As the oils get warm from the candle warmth - the room will get a very exotic aroma.
The wax is thicker though, so if you have accidents with it you may have to try more of my theories....to find the one that works! I've used all three with great success.
It all depends on the wax, colouring and fragrance!