I’m not sure what type of effect I would call this but I took two of my nature images and combined them in Photoshop and played around with the layer settings of each until I created something I kind of liked.
I wanted to try a true in-camera multiple exposure but after doing some research I found out that my Sony a7III doesn’t have that option 😦 So this is as close as I will get I suppose. Below are the two pictures I started with.
Offshoots Photography 
Your comments are appreciated