Something that makes me sad is how DSLR manufacturers insisted on making "digital film" instead of taking the next step and creating a truly revolutionary computational imaging tool.
For example, you could set up the camera in a studio to rapidly cycle through a set of flash guns, and then import the stack into Lightroom (or whatever) for this kind of additive light editing. This could then be programmed back into the flashes to create the final lighting composition.
This kind of process is regularly used in the film industry, where the same scene will be recorded with different lights turned on. Even camera motion is possible with robotic controllers. As a random example, I believe the new Blade Runner movie had the city flyover shots made this way.
A long time back... I thought about trying to capture motion in colors. Its not particularly novel and my first attempt with color print film (using a triple exposure and red, green, and blue filters) really confused the lab because the rest of the roll looked right, but this one print looked trippy.
My "ok, I could do this with black and white" had me thinking about Agfa Scala slide film (a black and white film) and then using red, green, and blue filter packs and print to color slide paper (cibachrome). I never found the lab that would entertain the idea (and the paper was $$) before I wasn't able to get that print done.