It's very fitting that, in a month where we're talking about an experimental author, I find a call for submissions from Blood Orange Review where the theme is Experiment. The part I think is cool about the prompts is, "We have purposefully chosen themes that can be interpreted in many ways, so if you think you have something that fits, send it to us. We look forward to reading your work!" So, they're pretty open to whatever direction you take the prompt in, which gives you a lot of freedom.
The deadline is June 2nd, so get those words flowing. Happy writing!