[Phantasm]

Pick up GURPS Thaumatology, and turn to the chapter on Path/Book magic. It's my understanding that several of the Paths there came directly from GURPS Classic: Voodoo. Alternately, check out GURPS Thaumatology: Ritual Path Magic and make a few Voodoo-like rituals there.

As I understand it, Voodoo uses a lot of charms, fetishes, and material components, as well as uses a number of Magical Laws such as the Law of Names and Law of Contagion (described in Thaumatology) for better bonuses to the rolls.

Hope this helps.