here is a list of minectaft skins, most of them are from this guys devinat art http://morri908.deviantart.com so credit to him
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Scootaloo
http://morri908.deviantart.com/art/Scootaloo-Minecraft-Skin-203543920?q=gallery%3Amorri908%2F14320558&qo=6
Luna
http://morri908.deviantart.com/art/Luna-Minecraft-Skin-203893680?q=gallery%3Amorri908%2F14320558&qo=5
Nightmare Moon
http://morri908.deviantart.com/art/Nightmare-Moon-Minecraft-Skin-203893909?q=gallery%3Amorri908%2F14320558&qo=4
Lyra
http://morri908.deviantart.com/art/lyra-minecraft-skin-203894381?q=gallery%3Amorri908%2F14320558&qo=3
Trixie
http://morri908.deviantart.com/art/Trixie-minecraft-skin-203894697?q=gallery%3Amorri908%2F14320558&qo=2
Gryphon (not Gilda.. just generic gryphon )
http://morri908.deviantart.com/art/Gryphon-Minecraft-Skin-204419638?q=gallery%3Amorri908%2F14320558&qo=0
Gilda By SladeJT
http://sladejt.deviantart.com/art/Gilda-Gryffon-Minecraft-Skin-211856549
Sweetie bell
http://fc03.deviantart.net/fs71/f/2011/108/9/2/sweetie_bell_minecraft_skin_by_morri908-d3ead9o.png
The following are by SladeJT
http://www.planetminecraft.com/skin/nightmare-moon-mlp/
http://www.planetminecraft.com/skin/princess-luna-mlp/
http://www.planetminecraft.com/skin/princess-celestia-mlp/
http://www.planetminecraft.com/skin/derpy-hooves-mlp/
http://www.planetminecraft.com/skin/zecora-mlp/
http://www.planetminecraft.com/skin/hooded-zecora-mlp/
Royal Pegasus Guard
http://gordon-weedman.deviantart.com/art/Royal-Guard-Minecraft-Skin-1-250434719
Royal unicorn guard
http://gordon-weedman.deviantart.com/art/Royal-Guard-Minecraft-Skin-2-250447790