Then in Properties, change the fill to a Texture, choose any type of texture and % amount...
Note: you won't see the picture underneath yet, that's what we'll do in the next step.
With the rectangle layer still selected, choose a Blend Mode - "Screen" or "Overlay". Then reduce the Opacity (the amount showing) to
50-80%.
You will have something like this...
Save as "texture" in your Z:>GA8>Photos>Basics folder.