I love Victoria's tarts, that you melt in a warmer. The scents are so strong and not at all chemical. One thing I did not like was the left over pool of scentless wax after each burn. Seemed like such a waste.
I've reused the wax from the warmer by pouring it into a new glass container, with a wick inside. They can be purchased from any craft store, usually in an aisle combining soap making, candle making, and other such things. I just put a dab of wax on the bottom first where I want the wick to sit, and then pour a layer on to hold the wick base down.
My favorite CBV scents so far (Have only tried a few dozen): Morning in Madrid, Fresh Squeezed Oranges, and Breakfast in Vermont.