How is this done?

Yes. With a sweep-creator a rail looped spline and one high-detailed cross section spline. Propably with the help of some bent-modifier.

Cheers
Frank
 
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* The geometry is quite simple, as Frank pointed out. I have just used a flower type spline as a cross section on a circular axis in a sweep. The circle is, of course, distorted to produce a linear spline as is seen on a tennis ball (a variant of a bi-cylindrical curve).
* As modifiers I added a twist and a bulge.
* About the material I can´t advise you. Some tricky fiddling with a gradient node should be required, but I know too little about this. Some simple brickwork should do :unsure:

Screenshot 2020-01-17 at 16.31.10.png


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* The simplest version is a set of subsequent ring selections and you just apply materials / colours to subsets of rings.
* As mentioned, there may be superior methods via the gradient node, but you will need to research that in the forum via the query function.

Screenshot 2020-01-17 at 17.34.12.png
 
Procedural version (still needs b/w pic for displacement because crumple modifyer lacks UV-mode):

image.jpg image2.jpg
 

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I couldn't figure how to do it with a procedural method,
and I knew Frank would show us how it's done. (y)

My method needs separate objects so assigning materials is easier.


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