A variation of Tasseography (also known as Tasseomancy, and sometimes Tassology), which encompasses Tea Leaf Reading. While the "technology" is somewhat different than for tea leaves, the basic principles are similar.
Readers, please enjoy this guest blog post by Sandra Kynes, author of several books, including The Herb Gardener's Essential Guide, Plant Magic, and the new Witches' Encyclopedia of Magical Plants, among many others.
Although a few old books...