I’ve been using HDR photography methods for quite some time now.
One thing I discovered by accident was how you can go “ghost photos” using one on of the HDR apps on my Android phone. In short, the phone takes 3 photos — one exposed correctly, one under exposed, and one over exposed, and then combines them into one final HDR photo. If you time things correctly, you can get someone or something to only appear in one of those three photos, thereby creating a ghost image you can see through.
I kinda love it.
Hope you do as well.