Each of them is in theory supposed to come with a different colour of wings - the unicorns with wings have the same style of wings in 5 different colours, green, blue, white, orange and a pinky orange while Twinkle Star has her own unique style. However, G2 was the first Hasbro generation to start the accessory colour switches on us to quite a degree so while each unicorn should come with a certain colour, its pretty common for the original 3 released - Golden I, Copper and Silver - to switch out the colours of their wings in their releases.