Whether from the the dentata variety (aromatic, known as French lavender) or stoecha (with the distinctive "rabbit ears"), lavender oils have been used as a painkiller, dabbed on wounds as an antiseptic, as an insecticide, and to promote sleep (try dried flowers in a sleep pillow). A tea made from the leaves is also said to soothe the stomach.
Apart from its wonderful aroma in cooking, thyme oil also has antiseptic and antibacterial properties; with its essential ingredient - used in cough syrups and lollies - you can use it to soothe sore throats.
Rosemary tea can be rinsed through hair to make it shine, or you can use the oil in a steam bath to cleanse the skin. Some people use it to treat upset stomachs or headaches.
For thousands of years, peppermint has been used for its antispasmodic, cooling, decongesting and mildly antiseptic properties; its fresh menthol smell is used to freshen breath and is said to deter insects and rodents.