If you apply Floyd Steinberg dithering to a linear gradient you’ll get a regular pattern. It’s a bit contradictory that you want a regular pattern on a pixel grid to follow a curve. Do a search on dithering and you’ll find variations. You might even find your source image again 
I wonder if you could use wave function collapse to arrange 3x3tiles Wave Function Collapse - has anyone done it with Grasshopper?
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