Inspired by this image of Applejack: [link]
The work in transforming this image to look like another character was not as difficult as I imagined. I am really happy with the outcome of this vector.
The high res Cutie Mark I used is from [link]
Feel free to use! Thanks for looking and reading!
Twilight Sparkle, MLP:FiM is (c) of Hasbro
Edit 12-22-12: Tail made smaller, body outline made more round, horn enlarged, further legs has different fill color, and eye lashes made sharper.