Purple. Because Saints Row: The Third. And maybe also because of some anime characters. Anyone whose colour scheme is purple always seems to be cooler and more powerful, which is probably related to the colour's historical relation with royalty.
...oh, also because Twilight Sparkle is best pony, although she's more of a lavender.
...oh, also because Twilight Sparkle is best pony, although she's more of a lavender.