For this tutorial you will need:
1. Paint Shop Pro (download
here)
and
2. Sandy Blair's Simple filters (download
here)
We will be using "diamonds" and "center tile."
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First open up Paint Shop Pro and open a new image 200x200.  Flood fill with a solid color of your choice.  For this tutorial, we used a teal green.
Our next step is to go to images, effects, and apply blinds with the settings below:
Your image should look like this: