First, and most obviously, there's the method of anointing yourself or an object with an appropriate oil for a ritual or spell. I've only done this once, as part of a little service to honor Hekate at the new moon. I wore the scent that bears her name  on my skin. In theory, being cloaked in scent would help create a working space, and help me focus...But that time, the ritual fell flat. The phone-line to Deity was connected, but I didn't have anything to say, so I just...listened to the dial tone. (I realized later that I was wearing my Athena owl necklace during the whole thing. That may have contributed to the awkwardness.) I intend to try again at the next new moon, if not sooner.
(Sidenote: The owner and prime perfumer, Beth, is a pagan too, and also provides "charged" ritual oils at Twilight Alchemy Lab. From what I've read by the people who've used them, they pack quite a punch.)
Most of the time, though, I use my selection for a far more basic purpose: to prepare for the day ahead. It can be just as effective as using it for a spell. I call it "perfuming with intent." For example, I've dabbed on Athens for Athena when I need a little strength. (Or Whip, when I want to be a SECRET DOMINATRIX. Ahem.) Simple psychology, right? But it's effective. Not to mention the compliments you'll get because you smell so good and/or interesting...
Does anyone else use scents as a part of their craft? I'd like to know!
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 "Also known as Krisky, Plaksy and Gorska Makua, she is a nightmare spirit, the Night Hag of the Woods, who haunts Polish, Russian, Bulgarian and Slovak children during the darkest hours. The only protection against her torments is a circle drawn around a child's cradle with a knife, or an axe or protective poppet hidden under the floorboards beneath where a child sleeps. Her scent is that of a lightless fir wood, nighttime air, wet forest mosses and upturned earth."
 "Magnificent three-faced Goddess of Magic, the Dark Moon and the Crossroads. She is the Mother of Witches, and the midnight baying of hounds is her paean. Her compassion is evidenced in her role as Psychopomp for Persephone, and her wrath manifests as Medea's revenge. Deep, buttery almond layered over myrrh and dark musk."
 "A reformulation and modernization of a true Classical Greek perfume, myrrhine: voluptuous myrrh, golden honey, red wine, and sweet flowers"
 "Agony and ecstasy: black leather and damp red rose."