fold the 3 shapes below into rectangles with two layers of paper everywhere. the white part of the image is the puzzle.
I'm sure you noticed the pattern in the shapes. now extend it and solve all shapes of that pattern. this will need a general solution.
in case it's not clear, the pattern is a large square (side >2) in the center with 4 small squares at the side.
Similar to ORIGAMI PUZZLES completed version which is also made by me.