This is a good way to take the stress out of story writing and give students ideas about how to use vocabulary effectively.

Teacher gives prompts orally and encourages students to flesh out the story with details, i.e. good vocabulary.

For example:

Two robbers walk into a bank.
Tell me about the robbers?
What did they look like?
What was the bank like?
Were there many people?
What did the robbers carry?
What did they say?

After this spoken part of the lesson, students can write their version of the story. There will be richer vocabulary used, as it has already surfaced during the first part of the lesson.