Does anyone know what "-PaperStyle" can be used for in Show-UDModal?

I'm working on redesigning one of our wizard driven experiences and had a crazy thought of putting a "translucent wallpaper" behind the modal so it could dynamically display the Hypervisor they're working in/on.
Show-UDModal | Devolutions PowerShell Universal | Product guides & reference



Here is a rough thing I put together in a screenshot tool.
Obviously, the images would be more transparent as to not interfere with the form.
But, I think you get the idea.