There are tons of methods of divination, and here are just a few:
Tarot and oracle cards are most commonly used, though if you assign meanings to other cards (such as playing cards), then you could use them as well. Each card has a meaning, and they offer answers depending on what order they are drawn.
Pendulums are crystals that hang from a chain. They are suspending from one’s hand and, depending on the direction they swing in (each direction is given a meaning), answers yes/no questions.
Scrying is gazing into an object (i.e. smoke, fire, crystal ball) until one “zones out” and images begin to flicker and flash before one’s eyes.
Usually runes or ogham, certain symbols assigned meanings (one could make up their own alphabet of symbols). They are carved or painted onto stones or pieces of wood and then “cast” or thrown onto a surface. An answer is given depending on which symbols are nearest the centre, which are face-up or face-down, etc. One could also use objects such as bones or gemstones that one finds on their journey through witchcraft; each object is assigned a meaning, and is then cast and read depending on the same variables.
Literally flipping a coin. Assign meaning to each side of the coin and then flip it to get your answer. This can also be done with a die.
This is when one poses a question to an open candle flame, and depending on how the flame reacts (i.e. sparking up or burning low), an answer is interpreted.
Flipping through a book and choosing a passage at random. That passage is the answer to a question posed.
Divining using melted wax. The wax is melted and then poured gently into a dish of ice-cold water. The shape the wax takes is then interpreted.
This means to divine using what is left of a fire, usually ashes, cinders, or soot. It could spell out a word or a name, or take shape of something with meaning.
(Cermonacy and telephramancy descriptions from The Element Encyclopedia of 5000 Spells by Judika Illes)