The Princess and the... What?

Today's Road Trip Wednesday questions asks:
In honor of this month's Bookmobile book, Marissa Meyer's CINDER, name a fable or story you'd like to see a retelling of. If you're feeling creative, come up with a premise of your own!

First, I can't help but wonder, is there a fable or fairy tale that hasn't been retold? Not that I've read them all, in fact the number of fairtyale retellings I've read is pretty low. Which is weird. Because I love fairy tales.

Anyway, Cinder, Beastly, Entwined. All awesome books. Growing up, Beauty and the Beast was my favorite Disney Cartoon, but it's been done. I also loved Hercules as a teen, also done. One of my favorite TV shows now is Once Upon A Time which pretty much runs the fairy tale gamut.

After scouring my kids movie shelves, I've come up with one! This has been done as two different Barbie movies, but I don't know if it's been made into a book. It would be a fun one to write, modern day or old-school (both of which Barbie did). Here it is:

The Princess and the Pauper.

A story about a rich girl and poor girl who switch places? I can already picture all the calamity that could ensue, already getting ideas of different ways you could spin it... 

So I think I'm gonna go take some notes. Thanks YA Highway for another new idea! And if someone does know of a good book version of this, let me know so I can add it to my TBR.