To prepare for the session, cut up some paper strips. They don't have to be coloured; you could use white scrap paper if resources are stretched.
You'll need enough glue sticks for one-between-two.
We got musical accompaniment to one of the stories!
Here's a totally frivolous activity for the end of term. The children worked in pairs and were asked to come up with a story chain where every link had one word written on it. It's an interesting dynamic, creating a narrative one word at a time, especially when it's two writers working together.
I offered a small prize for the longest chain and another for the most entertaining story.