I've sent this image URL to the list:


Here is how it is done. Feel free to try and publish werever you like:
I had not written the scirpt for that, but it is an easy one, just 
calling the described filters and procedures in the order described:

1) Paint horizontal strips of the desired colors on a blank image.
I fashioned a specially crafted gradient file for this, but it could 
be done in a lot of ways: painting by hand, repeated use of 
filters->render->pattern->grid (zeroing the width for the vertical 
strips) . Another way: Sinus fiter, getting horizontal "sinusoidal" 
patterns, followed by map to gradient, followed by 
filters->colors->map->to gradient, followed by index image using few 
colors, or desired palette (and them back to RGB image), and a couple 
of other ways.

2) Create a new layer and fill it with the Sinus filter 
(filters->render->pattern->sinus. Zero out the "y" range (second 
slider) for vertical strips.

3) If desired, warp lightly the sinus layer with Iwarp 

4) Filters->map->displace, on main colored layer, using the sinus 
filled layer as parameter. Turn off X. Increase Y displace to about 
160 - 200px.

5) If desired, apply iwarp fitler on resulting layer.

6) For making it tileable and increasing the "noise", use 
filters->map->make seamless.

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