I came across one section that sold aromatherapy humidifiers. They were miniature sized that let out a mist of aroma. You use essential oils and put them in the pot. I really wanted to buy one but figured the plug conversion thing might have been a hazard. So I figured just buy the essential oils and convert my humidifier into an aromatic machine.
This is my humidifier machine which I got last year.
Those are the aromatherapy oils I bought in Japan. They come in different aromas (of course) such as Eucalyptus, Juniper, Geranium, Rosemary...etc.
I put a few drops inside my humidifier and I have to say that yes it works quite well. But I think since it is not designed for this that the aroma only cycles through for a while and then goes away.
I think Korea makes aromatherapy machines but I have heard that they are not cheap. So if you want to make your home environment here more relaxing maybe modifying your humidifier is one step. I am going to look around the stores here to find bigger bottles of essential oils and see if they work too. Hmm with a little browsing on Gmarket I found this that might do the same thing. If my humidifier breaks in the process it will just have to be a sacrifice. hehe