There's a lot of different ways you can interpret the colors, but here's some associated concepts with them and a selection of cards I think showcase examples of them pretty well. Importantly, no color in magic is by it's own nature evil, and every color has the capacity for atrocity and villainy as much as heroism and valor.>White
Order, law, community, morality, honor, justice, retribution, stasis, zealotry, protection, martyrdom. When white is good, it's a shining beacon of light and law. When white is bad, it is blindly zealous, indiscriminate, and absolute.>Blue
Intellect, learning, the mind, perfection (specifically the search for it), dispassion, obsession, clarity, the future, the sea, discovery (of immaterial things), control. When blue is good, it is a force of improvement and discovery to improve the world. When blue is bad, it is callous and careless and mad in the single-minded pursuit of perfection.>Black
Amorality, self-actualization, parasitism, selfishness, morbidity, death, oblivion, viciousness, ruthlessness, decay. When black is good, it is devoted to its own desires in a way that betters all. When black is bad (as it often easily is) it is the archetypal villain, amoral and cruel and without empathy. >Red
Freedom, passion, emotion, chaos, impatience, fire, destruction, creativity, instability, lightning, wantonness. When red is good, it's free and unfettered and able to aid where others could not. When red is bad, it's blind and destructive and uncaring of the damage it causes.>Green
Nature, growth, destiny, natural order, simplicity, symbiosis, spirituality, tradition, recalcitrance, savagery, harmony. When green is good, it sees the way things are and the nature of the world and helps others find their place in it. When green is bad, it is a brutally Darwinian force that tramples over all things but natural might.