The result will be a nice looking Camo Background, that is pretty easy to make.
I. First, make a new image of 250x250. Set your background color to black, the foreground doesn't matter. Press ctrl+backspace to fill the canvas with black.
II. Click the paintbrush tool and set it to 8 pixels. Set your foreground to any color you'd like, but make sure its a light color. I chose 00C6FF. I kept my cursor at the top right, so I could just move the bar up and down and have a close-match darker color **for later**.
III. Now, draw a bunch of random lines. Cover about 50% of the screen.
IV. Next, duplicate the layer (ctrl+j). Set your foreground to a much darker version of your current color (I used 0024FF), and cover about another 50% of the screen. Leave balck spots. Set the blend mode to overlay and merge layers (ctrl+e).
V. Now to cover all those empty black spots. Duplicate the layer (ctrl+j), and press ctrl and click it to select it. Click Edit->transform->rotate 180º(degrees). Set the blend mode to lighten, and merge layers (ctrl+e). Press ctrl+d to deselect everything.
VI. We make the camo in this step. Press Filter->pixellate->crystallize. Set the cell size to 10 and press ok. Repeat step 5 (V), this time it will be with the camo instead of the lines, and set the blend mode to Darken instead of Lighten. Invert the colors (ctrl+I) on the new layer, then merge layers(ctrl+e). This left me with some nice green mix in the middle.
VII. Now repeat step 5, and use lighten again. This time don't merge layers. Repeat step 5 again. This time, rotate it 90º(degrees) CW, instead of 180º(degrees). Merge all visible layers (ctrl+shift+e). Thats all, except for...
VIII. Filter->brush strokes->crosshatch. Use these settings: Stroke Length - 20, Sharpness - 10, Strength - 1.
Finished Product:
Finished Product WITH crosshatch:
More Tutorials: 
