The use of a Celtic/Druidic pantheon mixed with a little ritual Gardnerian, and heavily stressing the elements, nature and the Ancient Ones.
They had a vast knowledge of and respect for the healing and magickal qualities of plants and stones, flowers, trees, elemental spirits, the little people, gnomes and fairies.
(From "To Ride a Silver Broomstick" by Silver RavenWolf)