The Isis Oracle: Divination Plate and Speaking Stones by Surcadiana may be of interest.

“Hand painted and stained 11.5″ wooden divination plate used to read the casting the 28 howlite dyed turquoise stones. Howlite can prepare the user to receive wisdom from the divine. It is a stone used to calm energies prior to meditation or readings. It can be used to access past lives and to aid in journeying. Each stone is hand painted with a different hieroglyph plus one blank. The board is used to divine answers to questions through spreads, the casting of the stones and as a spirit board using the blank as a planchette. The plate can also be used for offerings or charging talismans, jewelry, spell work, etc. Several mystery schools are represented and many divination techniques are possible with this system. Instruction book included teaches how to cast the stones and read their energies. Techniques for several spreads are also included.”