The Power of Gray - The Photoshop: Professional Retouching and Compositing Tips, Tricks, and Techniques - page 89

Figure 2.12 Final composite and retouched image
Textures, Textures, Textures
With blend mode compositing you can also use textures instead of photographs. In fact,
textures can be added to the gray paper to make it appear as though it was a solid brick
wall.