Here's what I've got at the minute:
Fragrance oil burner
I keep my oils, waxes, a few tea lights and a lighter in a small box. The advantage of an oil burner is that you can also use eucalyptus oil in water if you have a cold and this will help you breathe more easily.
Scented candles
I just finished the two scented candles I had, but I kept the tin of this one because it looks adorable. Apart from spreading a nice fragrance through the room, I find that lit candles help create a cosy atmosphere. The downside is that you should only use them while you're in the room. (The same thing goes for the tea light in the oil burner of course!)
Reed diffuser
I enjoy using all three types and could not tell choose which type is my favourite!
Sincerely,
R.