- Create a new layer and fill it with black
- Select Gradient Tool - Colors: Black to White, Linear Gradient, Mode: Difference
- Make short horizontal gradient strokes from left to right across the canvas
- Go over until it looks right
- Create two new layers - Color: Both 50% gray, Opacity: both 35%, Mode: one Darken and one Lighten
- Drag a fabric texture image on top and stretch it vertically
- Set the texture layer to Overlay
- Adjust Hue/Saturation