I kind of made it sound too simplistic - tossing lettered stones on the ground to spell a name was much more complex and I for one cannot comprehend it very much.
Following is a webpage that addresses the vast complexity involved behind the pagan-jewish "white stones with names" ritual. Keep in mind that this was sort of side-cult within the Jewish religion and not everyone of the Jewish community was involved in the teachings.
http://www.golden-dawn.org/intro_kabbalah.htm