Green
Abundance, stimulates growth, money, success, wealth, healing, health, marriage, fertility, employment, balance, financial success, good luck, new job, good harvest, nature appreciation, love.
Yellow
Intellect, wisdom and honor, action, inspiration and creativity, studying and intelligence, concentration, logic, learning, attraction, confidence, mental powers, inspiration, concentration, retention of memory, energy, cheerfulness, sunny disposition, changes, endurance, stability and security.
Yellow strengthens the imagination and concentration in a ritual. It's used in rituals in which the trust of a person is gained or in one where someone needs to be convinced of something.
Red
Energy, vitality, strength, health, passion, sex, love, protection, fire, fertility, fast action, potency, lust, blood, courage, warmth, attraction, magnetism, desire, action, willpower.
White
The Balance of all colors: Cleansing, clairvoyance, healing, truth-seeking, purity, innocence, clarity and unity, dawn, purification, peace, truth, protection, spirituality, general work, repels negativity, used to bring peace and heals emotions.
Note: White can be used in place of any other candle color and it is suitable for any ritual.
Pink
Devotion, love, tenderness and faith, friendship, romance, honor, caring, affection, forming partnerships, peace, emotional healing, raises vibrations, sensitivity, healing.
Gold
Enlightenment, protection, success, wealth, money, masculinity, playfulness, luck, divination, victory. Enhances communication and attracts the power of cosmic influences. Useful in rituals which are designed to gain fortune or money
Lavender
Mother consciousness, manifestation and selflessness, spirituality, compassion, understanding, inspiration, make contact with the higher-self, attract spiritual assistance, relaxation.
Blue
Communication, truth, peace, calm, losing weight, wisdom, understanding, protection, harmony, inspiration, patience, health and happiness, luck, loyalty, cooling, contentment, healing, idealism, harmony, devotion, meditation
Orange
Cleanses negative attitudes, situations and places, happiness, business deals, attracts good things, success, career, goals, stimulation, attraction, power, luck, sudden changes, warmth, energy building, enthusiasm, attracts prosperity, emotional healing, attracts friends, courage and ambition.
Brown
Earth, a balanced color. Rituals for material gain, eliminates indecisiveness, enhances powers of concentration, learning, telepathy. Expands financial success, finds lost items. Material prosperity, home, friendships, balance, animal magic, concentration and studying, wealth, success, intuition, psychic powers and ESP, protecting pets and it's said to help find lost items.
Purple
Use with a white candle to neutralize the effects of karma and ego. Ancient wisdom, the third eye, meditation, spirituality, success, confidence, hidden knowledge, protection, divination, all forms of expansion, expands what you already have, power, healing, recognition, enhances psychic ability, recognition in work, contact with the spirit world.
Rose
Compassion for self and others, higher mystical powers, humor, love, romance, opening the heart, forgiveness, compassion, healing, joy, creativity, endurance, strength, stability and security.
Peach
Restoration and rejuvenation
Violet
Strength, success, idealism and psychic revelation, enhances Neptune energy.
Ideal for rituals which are designed to secure ambition, independence and financial success or to establish contact with the spiritual world.
Ivory (beige)
Neutrality, balance and harmlessness
Black
Burning a black candle with any other color dissolves negative energies!
Protection, hex-breaking, reversing, banishing, destroying evil or negativity, binding, and repelling. Also used for healing very powerful illnesses.
Taken from: http://www.gone-ta-pott.com/candlecolormeanings.html