I just found this great Christmas writing prompt from Hayley at Bishop's Blackboard.If you have not checked out Hayley's blog, you should. You will find tons of creative and engaging lessons for teaching first grade standards on it.
Students write about what would happen if Santa got stuck in the chimney.
If you teach pre-k or kinder and your students are not quite ready to write their own sentences or story, then you could do a whole group shared or interactive writing lesson and then students could make Santa stuck in the chimney.
Santa Stuck by Rhonda Gowler Greene is a great book to use with this lesson.