From the same hand that brought us Art Nouveau Horse.
Out of Creative Haven Nature Mandalas Coloring Book by Marty Noble (Facebook page).
How is this My Little Pony? The image echoes the show’s color scheme, which hovers at the pink/purple end of the spectrum, albeit less pastel. MLP:FIM Wiki
BTW, in Googling the above, I came across a post on the creator’s motivation behind MLP: Friendship is Magic. My Little NON-Homophobic, NON-Racist, NON-Smart-Shaming Pony: A Rebuttal by Lauren Faust (Deviant Art page). Of note, the subtitle is extremely important. Earlier versions of MLP are too insipid to be borne. MLP:FIM counts as generation four. MLP Wikidedia