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Sample of Strip Graphic
I have made this much smaller than yours will be. And I used a filter to get the background effect but basically this is made as the tutorial demonstrates.
Another sample
This one uses just a plain background color and then I added texture to it.
You are not limited to anything so use whatever you would like to create. The main thing is the width and height. Let's try to keep that consistent for now.
Save the graphic to your Stationery Class folder.