kind of has that sci-fi feel to it
I use NX2 for editing my RAW photos. I like NX2, but it does not allow for much in the way of extreme manipulations that can be accomplished with Adobe's software. Overlaying two photos is easy to do in the camera, but generally it is not something I have found useful, but it does have a place, I suppose.
Another neat in-camera function I need to try out is Multiple Exposure. I could use it to shoot a running horse, for example, and capture the motion in a single frame. It would be fun to use with wildlife or at the least it has some potential. Making such an opportunity happen would be far easier said than done.