I had the start of an idea for a 2015 Christmas-themed module. It's, well, perhaps a little silly, but here goes...
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After a brief period of seeming redemption, the Grinch is back and he's worse than ever. An Ogre Mage, the Grinch craves nothing more than to inflict misery, especially those of innocent young children. Now he's figured out how to make millions of kids unhappy at once. His evil plan involves a cunning trap; in particular a magic globe of soul trapping. He knows that Santa is especially interested in gifts for the children, so he had a particularly charming-looking snow globe built with an attractive-looking winter scene inside.
Employing his slimy wiles to the maximum, he appeared at Santa's home the night after Christmas, when he knew the exhausted old man would be sleeping off his long trek. Mrs. Claus invited the disguised Grinch in for a hot cup of cocoa with marshmellows, and he gladly accepted. He gave a sad tale about how visiting the children at an orphanage had persuaded him to help with large a charitable donation, and so he had decided to donate a lot of toys for next year. When Mrs. Claus said that Santa would be sleeping for a few days, the Grinch said he would happily return later. Before he departed, he left behind the magical snow globe as a "sample".
A few days Santa arose, feeling renewed and ready to get back to work for the next years toys. As he was eating his breakfast, Mrs. Claus was reminded of the kindly visitor and she showed Santa the globe. When he touched the device, a powerful magical spell was triggered. Santa, his wife, several helper elves, and Santa's home workshop were rapidly sucked into a glowing vortex of energy... and became trapped in the snow globe plane. A gleeful Grinch was spying from nearby and so he was able to sneak into the ruins and steal away with the globe. The device rests now in the evil Grinch's cave lair up on a mountain side.
The party is approached by a group of helper elves, who ask them to help rescue Santa. They have become aware of the approximate location of Santa and how he became tricked, but they are just harmless workers who know nothing of the adventuring life. It is up to the party to enter the cave, defeat the Grinch, then find a way to enter the globe trap and release Santa.
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Basically it would need just a few areas: the cave system where the Grinch lives, and the interior of the Snow Globe. The latter would benefit from having a bunch of Christmas themed mods, as well as a chubby Santa. I think the snow globe interior should serve as a puzzle for the characters; they can find everything they need for Santa to escape, but they need to figure out how.