The incense I will take to a group Samhain ritual (this gave me a little over a quarter of an ounce of incense, which should last us about an hour. If you don't need that much, reduce the proportions accordingly):
Mix and then grind together equal parts sage (cleansing, protection and divination); patchouli (cleansing, protection and love); chamomile flowers (cleansing and enhancement of psychic abilities/dreams); and mugwort (healing, protection, divination, astral travel and past life regression). (I used about 1/4 cup of each of these herbs.)
Grind together (if not using powder) equal parts benzoin (purification and astral projection); frankincense (courage, protection and spirituality); and myrrh (purification, protection and spirituality). (I used about 1/2 tsp of each resin.)
Carefully mix in the resin powder with the ground herbs (this will be dusty - I recommend a larger than necessary ceramic or glass bowl, as deep as you can get). Fix the dry incense with equal parts patchouli, rosemary (cleansing, healing and love) and sandalwood (astral projection, divination, healing, protection) oils (mixed together, about a small blue dropper bottle full). Sprinkle the oil mixture by drops, turning the incense over and over with a wooden spoon. It will darken as the oil penetrates some of the dry herbs and resin powder.
If you've made a large batch like this and don't use it all at Samhain, I'd say it would be appropriate for any ritual celebrating the Goddess as crone and/or the God as sage, as well as spells cast to facilitate contact wth the spirits.