Once upon a time, there was a young lady who identified with a plastic horse with hearts on its butt more than she probably should. After discovering blind bag Flitterheart by accident online, she stumbled onto Strawberry Reef and, naturally, clicked on the Prototypes tab to see. She nearly cried at what she saw there--a gorgeous alicorn Flitterheart! Having never seen an error pony before, she was certain she'd never own one of her own, a fact that caused her almost physical ache.
In time, she found the Trading Post, and from there, the Arena, and got into pony collecting from there. One day, on Ebay, she found a treasure--not her precious aliFlitter, but the next best thing! The error pony from which her head came. So naturally she snapped it up, and with some doing, swapped the heads with a spare normal Flitterheart. And she resolved to be content with that, even if a proper factory error one never turned up.
But then! One day, in an Arena member's sales thread, she found her treasured grail! She fought and won the precious pony, and both princesses now live in her army.
(And don't worry, I can tell the two apart. ^^ The "custom" one has a dent in her leg from where the plastic strip cut into it in the box.)
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Welcome to the MLP Arena! 
at least the Princesses seem to be popular for customs?
Ffs guys, put her eyes further back and maybe a bit smaller, her eyes do not go on her nose!