Step 4. Make the lines wiggly!

'Filter', 'Distort', 'Ripple' ...Now you will get a warning message about needing to rasterize the layer, this is ok so just let it do it.

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now you have the little 'ripple' window. play around till you've got something you like, I went for 65% & large.
and when you hit OK ...voilà screen full of wiggly wave lines