I took 3 of the backgrounds and used the layer blend technique to make one paper. In Photoshop, It's Layer --> Layer style --> Blending Options. There's a slider on the bottom that says Blend If and it has two sliders - one for the top layer and one for the underlying layer. If you move the bottom one, it will push up the lights or darks (depending on whether you slide the black one or the white one). same with the other slider only it will push the top layer down.