All the world is a writing prompt.
Walk down the street. Any street. It doesn’t matter if you’re in a big city or out in the country side. Just go for a walk.
Keep your eyes open. Walking blind is a good way to trip, but that’s not what I mean. I mean look around you. What catches your attention? What strange and wonderful things do you see. What’s the story behind that strange looking rock or the tree that looks like it’s dancing? Who are the people or creatures around you?
There’s a story behind everything. You just have to look for the ones that interest you.
Then go home. Plant yourself in your chair. And write.