Gray Texture Tutorial
Here's what we're making:

1. Open your document. For textures I use 1024x768

2. Choose 2 shades of gray. I used #DCD9D9 and #E9E9E9. Using the Paint Bucket tool, fill the canvas with one of the colors.

3. Filter>> Render>> Fibers Set the Variance to 8 and strength 2.

4. Filter>> Brush Strokes>> Angled strokes Have your settings like mine.

5. Filter>> Artisitic>> Film Grain. Grain- 2 Highlight Area and Intensity should both be 0. Here's how it should look.

6. Use the burn and/or dodge tool (Soft brush 100px) and draw lines on the texture. You can also use the 1px brush in either white or black.