Here's just a quick one with a couple of images that have worked well in class as the starting prompts for both speaking and writing tasks.
The first, above, posted on our Instagram account, was as you can see taken in the street outside.
It's the sort of image I think you want for class — as it seems to tell a story of some kind. Add to it a couple of imaginative questions (see the Instagram post for examples) and you've got the basis for a great, creative, materials-light task, one that is going to require collaboration and plenty of interaction if you get your learners to produce their stories, whether oral (and perhaps recorded) or written.
The second, below was found on Twitter, as you can see:
In this case, apart from things like where the photo might have been taken, you want something along the lines of who or what is up there on the star and what is it that they (or the man on the beach) are trying to communicate…?
Thanks, Kim, once again, for trying that second idea with learners.
See also: Great Twitter feeds for images for class