These are your subjects according to your favourite colour.
Red: Potions
Green: Herbology
Blue: Charms
Yellow: Care of the Magical Creatures
Purple: Defence Against the Dark Arts
Black: Transfiguration
Pink: Muggle Studies
Brown: Ancient Runes
Orange: Divination
White: Arithmancy

PS: These are normal colours. If your favourite colour is something else, it should be shade of one of these colours.
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Comment yours!
Mine is Charms (again on purpose)!