I'm far from being the first to do this, and it's not even an original design for the dress (based heavily on this one, along with the general pose: http://razia.deviantart.com/art/Let-s-Party-Pinkie-Pie-443636044) but this will eventually be made into a title card for one of the chapters of the Silent Ponyville audio drama I'm working on--a background and text will be added, but for now, I wanted to show off the character, since I'll probably end up cropping some of it out.

BTW, those cutie marks were a BITCH! I actually found each one online and added them that way, but I think it might have actually been less effort to just draw them, due to all the resizing and warping I ended up having to do for each one. Oh well--I try to avoid drawing cutie marks whenever I can, since there are so many free resources for them online, and it's USUALLY a time saver to use them.

Silent Ponyville was written by Jake Heritagu and can be read here: http://www.fimfiction.net/story/106/silent-ponyville