Seeing no one's bothered to ask it yet - what exactly do you mean by folklore? Indeed, the whole cinematogaphic tradition (narrative or otherwise) could be seen as being Folklore in itself. If it comes down to the usual cosy quaint Mudcat Heritage view of Folkloric Revival then you'd be looking at Morris: A Life With Bells On, The Wicker Man (lovingly based on various layers of Folklore and Folkloric Interpretation) and things like Blood on Satan's Claw, which has the Folklore vibe in spades. Mark Gatis recently called such things Folk Horror, though whether that includes Morris : A Life With Bells On I couldn't possibly say, but if it's anything like the mawkfests of Brassed Off / Full Monty (etc.) then Horror doesn't even cover it.

Othewise, how about The Wonderful World of The Brothers Grimm?