I don't know why, but I always found the scent of patchoulli incense very soothing. While I haven't burned incense in a long time, the smell of patchoulli takes me back to the days when I meditated on a daily basis. I still have my old, brass Buddha in a box somewhere. Given my mood lately, a little meditation practice wouldn't hurt.
Do you have a meditation, prayer, or other practice that centers you? If so, describe it.