Seal of the Harvest. This is especially powerful on Mabon and Samhain, or other harvest holidays. The Roman god of the Harvest (Saturn) was often represented by a sickle, much like the sickle present in the harvest seal. I recommend creating this seal in chalk upon the altar for harvest rituals.
Triora, in Italy, is a sleepy little ancient hill town boasts an excellent museum of witchcraft, and to this day has a powerful association with witches. Some decedents of the original witches can still be seen in the town to this day