Aroma Web has a very helpful guide to hazardous essential oils. Some essential oils should not be used without oversight from a certified aromatherapist, if even that. If you are new to aromatherapy, check out the guide to familiarize yourself with toxic oils.
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Scrap yarn is great to make a colorful pom pom Christmas tree topper
If you like making pom poms and looking for a unique tree topper why not make a big ball of pom poms out of all sorts of colored yarn to make a statement tree topper. After you have made your pom pom tree topper featured at the blog Sugar and Cloth why not use the scrap yarn to embellish the branches like tinsel?