Oh yeah! I've seen the gradient filters that you can use to filter the light of the sky but let in the light from the ground. Similar concept, right? I want to experiment with filters, soon. I keep seeing amazing stuff like this and wanting to try it myself.
You're probably thinking of a graduated ND filter. This is a similar concept, but it would be hard to simulate the gradual change in the graduate ND filters with the filter paper. The closest you could probably get is to cut one paper in half so that the bottom of top of your lens has more light block than the bottom But that would lead to a pretty abrupt shift. But the ND film is pretty cheap and fun to play with regardless! :)
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