Open up a new transparent image 54 x 54.
Pick two colors for your background. One dark and one light.
I used #6b2523 for my dark red color, and #d7c8b3 for the light tan
color.
Zoom in 800% so you can see what you're doing and turn on your grid
with the pixels set to 1.
Use your selection tool set to custom with these settings:
Top 0
Left 0
Right 27
Bottom 27

Flood fill the selection using your light color.
Keep the selection floating and set your airbrush to these settings.
Shape-square
Size-27
Hardness-12
Step-14
Density-11
Opacity-36
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Spray paint in the center of your square, using the darker color,
about 6 times.
Deselect.
Set your paintbrush to these settings which are settings I use when
I pixel.
Size-1
Hardness-100
Step-1
Density-100
Thickness-100
Opacity-100
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Using your darker color and starting at coordinate 1x1 which should
be the second square in from the left
and second square down, start pixeling around the outside of your square
painting two pixels at a time
and leaving one pixel in between each set of two.
You should also have one row of your lighter color around the edges.
Add a new layer.
Copy and paste your apple as a new selection into the center of the
square you've been working on.
Select none.
Merge visible.
This is what you should have so far.

Duplicate this layer and move the duplicate square to the bottom
right corner.
Merge visible.
This is what you will have.

With your magic wand, select the top right empty square, add a new
layer, and flood fill with your dark color.
Keep it selected and using the same airbrush settings as before, spray
in the center of this square about 6 times using your light color.
Set your paintbrush to the same pixel settings as above and pixel
around the square with your light color using the same method as before.
Be sure you've left a border around the outside of these pixels with
the dark background color.

Duplicate this layer.
Image mirror.
Image Flip.
Merge visible.

That's it.
Just save as a jpg.