Go to one or more thrift stores, find the weirdest object/thing you can (you don’t have to buy it, just study it real well) and then write about it. What is it? What color? Texture? What is used for? Who owned it? Why is it in a thrift store? Where did it come from? Who bought it originally?
Do this with more than one item over the course of however many days it takes. Then sit down and create a short story / dialogue / scene that contains as many of the items you wrote about as you can.
*bonus prompt: write about the book in the picture below. What is written inside? Anything? Who was the author? How old is it? Where did it come from? Is it expensive? What kind of stories are told in a book like that?