Eco friendly recommendations

I've done exactly what you describe Vinny - saved every scrap of wax from scented candles, and not scented too, melted it down and poured it into a jar that had already had a candle in it.

If you want to do your own scented candles, just buy beeswax or normal candle wax in bulk - available on fleabay, and the essential oils, also on fleabay dirt cheap. The more essence you add to the wax, the stronger it smells. It's good fun I think! I never did it to sell though.