Here lies everything.
The world I wanted at my feet.
My victory's complete
Arise and sing.
Derpy Hooves on a Canterlot throne.
(Due to the helmet she is probably a General Derpy)
Upd: You can find psd source and hi-res image in a premium section
Upd2: When I worked on this picture, I thought of some apocalyptic background.
Apparently there was a war between New Lunar Republic and Solar Empire, Derpy took a Luna side as a general. When Luna died in her hooves, Depry swore to overthrow Celestia from the throne and kill her for good.
Such a tragic story.