I had to.
Totally borrowed this awesome dude's work because I was too lazy to do it myself: [link]
UPDATED: You know, at 1AM, you sometimes forget that Derpy is a pegasus pony...added wings.
THE UPDATE HAS BEEN DOUBLED: Here's the PSD if anyone wants to toy with it. Hell, you could do a full recolor if you want. Just link me to your work if you upload it...I wanna see it.[link]
Copyright Hasbro. Their ponies, not mine. Unfortunately.