Step 5
Now let's do the top.
Layers > New Raster Layer... > Ok
On the Tools toolbar, select the Selection Tool (S)
On the Tool Options palette, Selection type: Square
Were going to create a smaller piece almost the same way we did the main pattern. Create a small square selection along the top of our diamond pattern:

Selections > Edit Selection
On the Tools toolbar, select the Raster Deform Tool (D)
on Tool Options palette enter 45 for the Angle:

Now, lets move the selection back towards the center by grabbing it from the center node, only this time make sure that you line up the bottom node up with the bottom of top piece of our pattern:

Selections > Edit Selection
Our Foreground color should still be set to use the Fading White gradient.
Use the Flood Fill Tool (F) and fill the layer
We'll make this piece a little darker.
Adjust > Brightness and Contrast > Brightness/Contrast... > Brightness: -124 Contrast: 15 > Ok
Selections > Select None
Your image should now look similar to this:

On the Tools toolbar, select the Selection Tool (S)
Create a selection over half of the new piece:

We'll make this piece brighter.
Adjust > Brightness and Contrast > Brightness/Contrast... > Brightness: 255 Contrast: 15 > Ok
Selections > Select None

Because this piece is a bit brighter, we'll help define it's edge a bit more.
Layers > Duplicate
Even if just a little bit, you'll notice that the edges of the image are much better defined.
Layers > Merge > Merge Down
Now let's make this piece a bit wider, and bring the top edge down.
On the Tools toolbar, select the Raster Deform Tool (D)
Stretch both the left and right pieces wider (not to much) and bring the top edge down:

Layers > Duplicate
Image > Mirror
Move it over to the left edge. Go ahead and reshape it if you need to. When your finished, lets darken it.
Adjust > Brightness and Contrast > Brightness/Contrast... > Brightness: -73 Contrast: 15 > Ok

Now the other side.
Layers > Duplicate
This time, don't mirror it, just move it over the right edge:

On the Tools toolbar, select the Selection Tool (S)
Create a selection over half of the new piece:

We'll make this piece brighter.
Adjust > Brightness and Contrast > Brightness/Contrast... > Brightness: 255 Contrast: 15 > Ok
Selections > Select None

On the Layers palette, your top layer should be highlighted. hide the bottom layer:

Layers > Merge > Merge Visible
Un hide the bottom layer:

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