Page 4 - Background

Open up the render that you want in your sig and paste it in. Duplicate your render until it covers your whole sig. Merge all the render layers together and go "Filter > Brush Strokes > Angled Strokes". Make the Direction Balance 50, the stroke length 25, and the sharpness 2. Duplicate that layer and go "Filter > Blur > Motion Blur". Make the angle -35 and the distance 35. Set the blending mode of this layer to "Screen".