Image may be NSFW.
Clik here to view.
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STEP 1:
Start with prepare canvas. The canvas can be any size but not less than 10x10 pixels, because our pattern size are not less than 10x10 pixels. In this tutorial I use 100x100 pixels, it will facilitate when "Zoom in" and "Zoom Out". After determining the size, next is click "OK" button. Image may be NSFW.Clik here to view.

STEP 2:
Enlarge the size of canvas view to the max Image may be NSFW.Clik here to view.

STEP 3:
Create image using "pencil tool", Image may be NSFW.Clik here to view.

STEP 4:
With the format pencil tool; diameter 1px, brush color black #000000 and opacity 100%, Image may be NSFW.Clik here to view.

STEP 5:
Create a new layer, this layer will be used as a place for our shape pattern later. Image may be NSFW.Clik here to view.

STEP 6:
Create image as shown below on the layer that we have create on the STEP 5, Image may be NSFW.Clik here to view.

STEP 7:
With "Rectangular Marquee tool", create selection like the image below Image may be NSFW.Clik here to view.

STEP 8:
Then crop the image by choosing Menu "Image" and sub mene "Crop", Image may be NSFW.Clik here to view.

STEP 9:
Click the eye image on the "Background" layer, so that the image we have created on "Layer 1" look transparent, Image may be NSFW.Clik here to view.

STEP 10:
Then create the image to the pattern by choose Menu "edit" and sub menu "Define Pattern", Image may be NSFW.Clik here to view.

STEP 11:
Will appear a tab like the image below, then please write the pattern name and click "OK", that's it your pattern finished. Image may be NSFW.Clik here to view.

Clik here to view.

Clik here to view.
