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Hi Pocahontas

Your objective your are trying to achieve and you question may not be clear enough to answer.

The original image are gray scale clouds

The second set of images do not scale with the gray level.  It appears that the second set of images is just a filled pattern of a selection.  That selection is achieve by a  Threshold Adjustment Layer to create a B&W boundary and the use of a magic wand tool to form the selection and a then pattern fill.

The third set seems like you are trying to achieve something quite different which is a gray scale image using a pattern.  I am not sure I understand your objective yet images with varying tone which is based on a pattern is possible.

So I suggest maybe providing some clarification on your objective and maybe sharing a screen shot of your image and Photoshop Layer Stack for the approach you are attempting.

Just a suggestion

John Wheeler