*Many of my short story prompts have come from the Your Story competition on writersdigest.com. Every couple of months, they have a contest that’s free to enter. You’re given a prompt and asked to do something specific with it, like write the opening line of a story inspired by a given picture in less than 25 words or write a 700-word short story starting with a specific phrase.
From each contest, 5-10 finalists are announced, then those on the Writer’s Digest forum vote on their favorite. You could vote, too! I’ve yet to be a finalist, but it’s been a great exercise for me. Here are links to my stories/works thus far.