Image Overlay

[Ofnuts]

Too late to go with much detail.

Two scripts of mine;

• ofn-truchet-path generates the truchet pattern as a path
  
• ofn-engraving takes an image and stroke a path with varying width according to the luminosity of an input layer
  

For instance:

Starting with this:

   

You generate the truchet path with ofn-truchet-path (rendered here for demo, but not necessary)

   

You generate the pattern of lines of varying thichness with ofn-engraving

   

You can then overlay this over the initial image

   

The engraving script generates lines that are wider where the image is dark (it is assumed you stroke dark lines). In you case you may have to use a color-inverted version of your image as a source since you want white lines that are wider where the image is light.