Throughout history, divination has been used to try and see what may come to pass. to gain insight into a question or situation by way of a standardized process or ritual.
Presented here are just some of the methods that were used. Most, rely on the object in question being thrown, dropped or otherwise moved in a random method. The patterns the object shows is then interpreted by the divine in the hope of gleaming some knowledge.
For the divination that uses dead or flesh, the colors of organs or other internal matter, the position, any weird growth's etc is used for the random pattern needed.
It's up to you if some, or any, are effective, or if they are just used to fool the masses.
All of these are based on real methods of divination that were, and sometimes are, still being used in the world today.