The first video seemed a bit too fast, so I made a slower version that better matches the gif.

Deviantart:  http://deathpwny.deviantart.com

Gif version 480p: http://deathpwny.deviantart.com/art/We-Wuf-our-Derpy-low-res-animation-286173922
Gif version 1200p: http://deathpwny.deviantart.com/art/We-Wuf-our-Derpy-animated-286173676

Original picture (high resolution): http://deathpwny.deviantart.com/art/We-Wuf-our-Derpy-283981589
animated Derpy (low resolution):http://deathpwny.deviantart.com/art/Derpy-animations-test-2-285959470
animated Pinkie (low resolution): a href="http://deathpwny.deviantart.com/art/Pinkie-animation-test-286009674"
animated background: http://deathpwny.deviantart.com/art/Background-animation-test-286024513

Music is
https://www.youtube.com/watch?v=sTugwPjEa2k

Thanks to SoGreatandPowerful for letting me use it
http://www.youtube.com/user/SoGreatandPowerful