Useful based on your personal color associations.
Some color associations include:
Protection, focus, forgiveness, good fortune, water, truth, calm, cooling effect (useful for strong tempers and situations), freezing, contemplation, mental acuity, healing, communication, creativity, justice, inspiration, harmony, peace of mind, communication, travel, psychic, spirituality, higher self, peace, dream remembrance, transformation, opening portals, traversing emotional and psychic depths and finding secrets that are hidden
*Water Magick, Ice Magick, and Moon Magick*