Calendula has a long history in magical lore.  It is bound to Sun and Fire.  It is believed to be useful for prophetic dreams, protection, respect, and psychic powers, and to be of benefit when legal matters arise. 

For protection, hang garlands of Calendula over entry doors to prevent evil from entering.  Scatter petals under the bed for prophetic dreams and for protection while sleeping.

For legal matters, carry Calendula petals in the pocket for a favorable outcome in court matters or meetings related to the law. 

Put a mesh bag of Calendula petals under the faucet when running bath water, and you will win the respect and admiration of everyone you encounter after bathing in it (it also highlights the hair - see Calendula in Medicine). 

It is said that if a woman touches Calendula petals with her bare feet, she will understand the language of the birds. 

There is also an old recipe that calls for mixing dried Calendula flowers, Marjoram, Thyme, and Wormwood and grinding them into a powder.   Simmer in honey and white wine, and then rub over the body to induce prophetic dreams about your future husband or wife while chanting your wishes.  If the candidate is good to you in the dreams, they will make a loving spouse, but if they treat you badly in the dream, they will be disloyal and uncaring.