The essential oils of most aromatic herbs contain the active ingredients that are beneficial in medicines.  Steam distillation is done commercially to extract the oils, and these oils are much stronger than concoctions made at home, so adjust accordingly if you are using a prepared herbal oil.  

To make your own herbal oils and ointments, combine about 4 ounces of the fresh (or 2 ounces of dried) herb with 1 pint of olive, safflower, or other pure vegetable oil.  Heat gently, uncovered, for about one hour.  For oil, strain, bottle, and cap tightly when cooled.  For a thicker ointment, add 1 to 1-1/2 ounces of beeswax to the mixture as it heats.  Let cool and bottle appropriately.  

Occasionally, lard is used instead of vegetable oils.  If you have a  recipe that calls for this, use 2 ounces of fresh herb (or 1 ounce of dried) in 3/4 pound of fat.  Heat slowly, and when the herbs have broken down,  strain and let the mixture set.  Again, beeswax can be added while the mixture is still warm for a firmer ointment.

Essential oils have many uses both medicinally and in aromatherapy.  Try a few drops in hot water or in a facial steamer to freshen the face, or several drops in a warm bath for relaxation.  Put a few drops  in a spray bottle for an immediate pick-me-up on a hot day, or spray around a room for your own brand of air freshener.  After a shower, put a few drops of your favorite herbal scent on a wet washcloth, rub all over, and air dry.  For wonderful smelling laundry, drop 5-6 drops into the wash load. 

Medicinally, many herbs make great topical remedies for various ailments.  Please see the Herbal Remedy Chart for ideas on what types of herbs to use for these purposes.

These are just a few of the many things you can do with your own homemade essential oils, so use imagination and find ways to enhance yourself and your home with your own unique aroma!