Oak Tarot   

Simple tarot images painted in primary colours on 5cm rounds of oak wood. The cards of the Oak Tarot show the oak pieces lying on a pale blue background.

Ocean Oracle   

The Ocean Oracle introduces divining with shells in this huge deck of 200 cards. The front of the card has a photograph of the seashell; the back has the common and Latin name for the shell, and its meaning. It's a workable divination deck and a thorough reference on seashells.

Ogham: The Celtic Oracle   

Ogham: The Celtic Oracle has 21 large cards, each featuring a tree significant in Celtic and Druidic mythology. Illustrated by Peter Pracownik, who has created fantasy artwork and the Dragon Tarot.

Old English Tarot   

The medieval English style artwork has a has a wonderful soft, old-fashioned look. The majors are quite simple figures, while the minor arcana show the suit elements and a tiny scene at the base of the card.

Olympus Guardian Tarot II   

The Olympus Guardian Tarot II is a majors-only set from South Korea. The cards depict Ancient Greek deities and game symbols and ratings.

Olympus Tarot   

A tarot of the Ancient Greeks. Each card in the Olympus Tarot represents a myth, hero, monster or god from Greek legend, depicted in dramatic comic-book style.

One World Tarot   

The design is ultra-modern and computer-generated in the One World Tarot deck. It focuses on the astrological aspects of tarot, but also touches on numerology, color theory and other esoteric symbolism.

Oracle of Illumination   

The Oracle of Illumination is designed by a teacher of colour therapy and combines colour, light and numerology in the illustrations on its 72 cards. Its guidance is intended to 'assist the individual in manifesting their true potential with grace and confidence'. Sold in a boxed set with a 240-page companion book.

Oracle of Shadows and Light   

The Oracle of Shadows and Light is a cute and quirky little oracle of 45 cards. It features large-eyed faeries, ghosts and angels that are reminiscent of Blythe dolls, each with a slightly shadowy personality or theme.

Oracle of the Dragonfae   

The Oracle of the Dragonfae has 43 cards with rather pretty illustrations of goddesses, gods, dragons, winged fitures and fantastical characters. It is attributed to Australian deck creator, Lucy Cavendish, but actually has cards contributed by seven different artists.

Oracle of the Dreamtime   

The Oracle of the Dreamtime is not only an oracle but a collection of contemporary Australian Aboriginal art. It's a very well-researched deck and the artwork and symbology is based on authentic Aboriginal Dreamings.

Oracle of the Goddess   

The Oracle of the Goddess set from Sylvie Winter and Jo Dose (not to be confused with the many other decks of the same name) has 33 attractive cards with goddess archetypes. It's very similar in look to the Vision Quest Tarot, from the same creators.

Oracle of the Grail Code   

The Oracle of the Grail Code: The Restoration of the Feminine is a divination system based on the previously hidden Feminine side of the legends of the Holy Grail. The deck has 33 beautiful cards with image of old paintings, that correspond to 33 qualities and principles of the Divine feminine. Intended for for creativity, insight and transformation.

Oracle of the Radiant Sun   

The Oracle of the Radiant Sun is another deck from husband-and-wife team Caroline Smith and John Astrop, who also created the Runic Tarot, Elemental Tarot and Moon Oracle. The 84 cards are based on solar astrology, and are divided into seven suits with old-fashioned and often surreal illustrations.

Oracle of the Shapeshifters   

The Oracle of the Shapeshifters has 45 cards of mystic familiars. By the creative team of Lucy Cavendish and Jasmine Becket-Griffith, who also did the Oracle of Shadows and Light, it has a similar cast of large-eyed characters on the cards. Due out in mid-2013.