I have a cold at the moment, and it's cramping my style a bit, perfume wise. Perfume is to be avoided during colds, it's a waste because you can't smell them well and they may aggravate a cough or sensitive noses. However, there are a number of aromatherapy essential oils whose pleasant fragrance can actually have a therapeutic and comforting effect if you get a cold or stuffy nose or congested chest from the flu.
Thyme can be used in a diffuser to purify the air. If you are at home or at work, sneezing or coughing and congested, this can get rid of a lot of the germs in the air and has an uplifting effect on the body and mood also, which can be very helpful when dealing with a cold. As we know, they are often not bad enough to stay home but affect your energy at work and the stuffiness can be very uncomfortable. A few drops of certain beneficial essential oils can be mixed into water, and misted around the environment. Eucalyptus, rosemary and peppermint impart a comforting decongesting quality to the air around you. Eucalyptus or tea tree oil drops on a tissue or inhaled in a steam bath can break up sinus congestion. These essential oils actually kills cold germs. If you can take a bath with some mineral salts with lavender and rosemary oil, the heat will ease the aches of a cold or flu and act as a steam inhalation of the therapeutic oil to help clear and soothe the nasal passages. At the same time this is healing and cleansing for the skin because of the antibacterial qualities. Ravensara and ginger are also often used for steam inhalation. Ginger tea, made by taking sliced ginger root and boiling it in water for ten minutes, then straining, can surpress a very stubborn cough and is also good for the headache you can get with fever.
See this link to Naturopathica, which carries some good cold care remedies in essential oil form and as a chest rub.
Above, a type of ginger flower. There are many kinds, some used more for fragrance and beauty, some more for cooking,