First open a new document with the following settings:
Width: 1px
Height: 20px
Background: Transparent
Now take the pencil tool and make something like this:
When you've got it, we'll define it as a pattern: Edit > Define pattern, input the name you want and click Ok.
Now you can open the image you want to use. Create a new layer and fill it with the new pattern: Edit > Fill and select the pattern we've just defined and apply it to the layer.
Now we're going to rotate it. With the layer that contains the pattern active, go to Edit > Transform > Rotate and change the angle at the top bar like below (it's marked in red):
Your pattern will have diagonal lines now. Take the rectangular selection tool and make a selection like the one below.
Go to Select > Inverse and click Ctrl+X to cut that part of the layer.
It's ready now, you may move it, rotate it or change the layer's blending mode to your liking.
Tutorial © Melfina. Do not reproduce in any way without previous permission from the author. Printed from http://celestial-star.net