Ahahaha we already thought on their colors.



Twilight Sparkle: Purple.

Spike: Green.

Pinkie Pie: Pink.

Applejack: Orange.

Rarity: White.

Discord: Black.

Sunset Shimmer: Red.

Rainbow Dash: Blue.

Fluttershy: Yellow.



Sound about right on the colors? Does to me, seeing as how they all have those colors in the credits of Rainbow Rocks (Except for Discord, that is, as Discord has yet to make an appearance in the Equestria Girls movies... Well, aside from that one cameo as a plushie that gets smacked with a hammer by Fluttershy in one of the shorts, that is).