Step 2
This is the most important part to the whole tutorial. In order for it to look right, we're going to cut some pieces off of this to complete our pattern.
On the Tools toolbar, select the Selection Tool (S) 
On the Tool Options palette, Selection type: Ellipse
Create an elliptical selection along one side of your image. You can move it into position by holding down on your RIGHT mouse button and dragging it into position.:
Now we want to offset it slightly, so we'll put our selection into edit mode.
Selections > Edit Selection
Select the Pick Tool(P) from the Tools toolbar.
Grab it from the center node and rotate it slightly:
Take the selection out of edit mode
Selections > Edit Selection
Now hit the DELETE key on your keyboard:

Don't select yet! We still need to cut the other side.
On the Tools toolbar, select the Selection Tool (S) 
Now, hold down on your RIGHT mouse button to drag it to the opposite corner like this:

Now the fun part. We want to protect a portion of the upper right corner of our image. This will will make better sense in just a second. To do this, we're going to add to our elliptical selection.
On the Tool Options palette, Selection type: Rectangle
While holding down on the Shift key on your keyboard, add the small rectangular selection to cover our upper right corner:

Your selection should now look similar to this:

Selections > Invert
Now hit the DELETE key on your keyboard
Selections > Select None
Your image should now look similar to this:

Now the final piece to our pattern.
Layers > Duplicate
Image > Flip [Keyboard shortcut: Ctrl + I]
Image > Mirror [Keyboard shortcut: Ctrl + M]
On the Tools toolbar, select the Move Tool (M)
Line the duplicate image up with the bottom of our original image:

Layers > Merge > Merge Down
At this point you may want to create a selection and save it to the Alpha channel.
Selections > Select All [Keyboard shortcut: CTRL + A]
Selections > Float [Keyboard shortcut: CTRL + F]
Selections > Defloat [Keyboard shortcut: CTRL + Shift + F]
Selections > Load/Save Selection > Save Selection To Alpha Channel... > Save
Don't de-select yet!
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