Something I came across when playing around in PS. How to do:
pick your two colours and go to Filter > Render > Clouds then Filter > Pixellate > Mezzotint and pick Long lines. Then Filter > Blur > Radial Blur, you want Amount 100, blur method Zoom, quality best. Next choose Single Column select and click a little to the right of the middle. Press Ctrl+J to make a copy from this. Using the move/resize tool, drag the single line to cover the entire image. Set this new layer to Linear Dodge, and ya done