I've been playing with @CuttleXYZ a bit more. Here I made a nice tiling using the Rotation Tiling and Tiling Grid modifiers, then I wrote a custom modifier to fade out the colours on the outer pieces.
Here's a link: cuttle.xyz/@christianlp/T…
@CuttleXYZ Following feedback from my wife, whom I married for her colour vision, here's a less eye-searing version