Apologies to my vegan friends, but I just adore beeswax candles. They're purported to having air-purifying qualities, and indeed, they impart a delicate yet intoxicating honey smell in the room. Unfortunately we don't have a fireplace, but these natural candles are certainly the next best thing. They create a warming glow on cold nights. Perfect to knit by.
These people make the best ones that I know of. Worth every penny, and if you take care of them properly, they last quite a long time.