First to deny it, Pinkie Pie'd it.
Here's my first MLP comic, though I don't intend to make it into a habitual release. I got the idea from a scene in "A Canterlot Wedding, Pt. 1" where Pinkie Pie sneezes confetti... And now we know. (Sorry, it's a fart joke. Purely a fart joke.)
I've released Rainbow Dash chillaxing in the tub as a separate piece: [link]
Featured on EQD - June 2nd [link]
"My Little Pony: Friendship is Magic" & Original Characters © Hasbro