It would be a lot easier if you have a drawing that is already drawn with black outlines.
You can recreate similar style with the filters Artistic>Crosshatch, Poster edges with some Texture filters. Test with the settings in each filter combinations and you will get interesting results.
This page may help you out:
http://help.adobe.com/en_US/photoshop/cs/using/WSfd1234e1c4b69f30ea53e 41001031ab64-7986a.html
No, I meant custom patterns.
Just create a black and white Pattern, blur it somewhat (this may take some experimentation), set a Layer with that Pattern to Hard Mix and add a Hue/Saturation Layer set to 0 Saturation above – this would naturally be unnecessary if you work in grayscale right away.
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