Cardboard on wood

I am not aware of anybody else trying to glue pieces of cardboard to guitar body wood and calling that a finish.. as there are in principle many ways to do that, I'll test a few that come to my mind and see if any of them work.

This is my testing board:

I've epoxied four 3x3 square sections onto a piece of plywood. I clamped them overnight, now I'll let them set for some more time before applying different types of finish to each one.