Once Upon a Time
I imagine that many romance readers spent their childhoods repeating the same request I did, "Tell me a story." The favorite stories were always fairy tales. Romance novels and fairy tales have quite a bit in common: they contain some level of formula and some element of fantasy, they focus on a romantic pair, and they are both often dismissed as trivial. To the last claim, I will say that almost anyone, anywhere knows a basic version of the stories grouped below without me having to give any further information. That's cultural power.
These books are some of my favorites that take a familiar fairy tale plot and spin it into a romance novel. Did I miss any of your favorites?