Open up a new document.
This window will open up. If you want a large-blotched camouflage, choose 5200 by 5200
If you want a small-blotched camouflage, choose 1024 by 1024
Go to -->Filter-->Render-->Clouds. Press CTRL+L
This will be your base camouflage layer. Move the left and right pointers to the center.
Right click the "Background" and click "Layer from background".
Call it whatever you like.
Make a new layer by using: CTRL+Shift+N, this will be the main background color.
Don't forget to drag this under the main camouflage. And hide the "cow camouflage layer"
Fill this background layer with white.
Find a color scheme and/or camouflage that you want to use, and open it in Photoshop
Select the background or most common color with the color picker tool
Switch to your new document
Fill the color you picked from the document
Show the main camouflage layer.
Go to Select-->Color Range
Max out the fuzziness and select the white color
Go to Select-->Modify-->Smooth
Type in 20 for the sample radius
Push the delete and/or backspace key on your computer to delete the white spaces
Inverse the selection by going to Select-->Inverse
This is the result.
Switch to the color scheme/camouflage document, and select the second-most common color
Switch back to your new document and go to Edit-->Fill
Select color on the drop-down menu, and select the color you chose from the other camouflage.
Like so:
Another example:
Click "Ok"
Now, you can show the base layer to see the start of the camouflage.
Hide the last two layers after making a new layer. Repeat the camouflaging process on two to three more layers *THIS IS IMPORTANT: SHIFT THE POINTER IN THE LEFT DIRECTION A LITTLE BIT MORE FOR THE NEXT TWO TO THREE LAYERS* and you will get something that looks like this: