This Is The End result
First we need to define two patterns:
Step 1
Open up a new canvas, width=37px, height=37px. Transparent background
Step 2
Set white to your foreground color
Step 3
Select the line tool with weight: 10px
Step 4
Draw a line from the top left corner, to the lower right corner.
Step 5
Duplicate this line 2 times.
Step 6
Select a line and hit Ctrl+T
x: 18px
y: 55px
Step 7
Select another line and hit Ctrl+T
x: 33px
y: -4px

Step 8
Deselect the shape and go to Edit -> Define Pattern, save it!.
Step 9
Open up a new canvas, width=3px, height=3px. Transparent background
Step 10
Select black as your foreground color. Select the Pencil Tool and make 3 'dots', like this:

Step 11
Go to Edit -> Define Pattern, save it!.
Step 12
Now the real job starts. Open a new canvas, width=300px, height=1000px (or higher)
Step 13
Select the Gradient Tool. Click the bar at the top and specify the following colours


Step 14
Add a new layer, fill it with a background colour (doesnt matter which colour), and set fill to 0%

Step 15
Double click the layer to open the layer properties window, and apply the white pattern

Important: I set the transparency to 6%
Step 16
Add another layer, fill it and set fill to 0%
Step 17
Double click the layer to open the layer properties window, and apply the black pattern

Important: I set the transparency to 10%
You should now have something like this
Step 18
In order to slice it correctly, merge all layers by clicking Shift+Ctrl+E
Step 19
Select the Rectangular Marquee tool, with fixed dimensions. Width=36px, height=1000px. Click on the topleft side of the screen and copy the selection. Open a new canvas with the same dimensions and Save for web!

