The pen vector tool is one of the most versatile functions there is in Photoshop. Imagine it like this, you can create very smooth beziel outlines that can be filled with a colour and then stroked with a soft brush of your choice, depends on the hard-edge-ness you want of the camo pattern. It makes for very fluent looking camo patterns. Also, using the this way, you can go back and edit the camo pattern very easily as much as you like, allowing a much more accurate camo pattern. Doing it by freehand with a brush can be very time consuming and often results in a jittery edged effect due to being drawn by hand. Came up with a quick tutorial on the basics of the pen tool...