Generate a Patterned Layer

In the interest of time, without a lot of precision measurements, I'm going to 'emulate' the pattern in the sample, rather than trying to duplicat it. So, we'll need a nice, uniform pattern for the "lines" in the background. Sizing the pattern will be seat-of-the-pants -- looks about like 12 pixels off and 12 pixels on. So I'll generate a pattern and fill a layer with it before blurring.