Edit: Use the stupid shader!
I (Thai) came up with an initial art style… This may change though but was what I came up with.
I used a technique called “Gradient Mapping” to map lightness to color domain.
Open an image, scale it down to 1920 pixels wide and desaturate it. Use any desaturation basis.
https://s3-us-west-2.amazonaws.com/secure.notion-static.com/7690ba31-0c2a-4b30-8e01-efe98a681f81/untitled
To give each color an equal chance of appearing, use the Equalize filter.
https://s3-us-west-2.amazonaws.com/secure.notion-static.com/fbde2461-fbe2-44fb-bc64-dc0bf0bdc2b5/untitled
Use the Gradient tool and configure as follows
https://s3-us-west-2.amazonaws.com/secure.notion-static.com/a3e5eb52-2162-4733-b5da-f7da3fcf3a1b/untitled
Perform a Gradient Map. You can try Inverting the colors before doing Gradient Map.
https://s3-us-west-2.amazonaws.com/secure.notion-static.com/438485bc-7cb0-41b3-8fa0-075c2796dcf7/untitled
Convert to Indexed color mode, generating an optimum palette of 8 colors.
https://s3-us-west-2.amazonaws.com/secure.notion-static.com/127757d9-3b5e-48ab-8db5-c86a5a88b5df/untitled
https://s3-us-west-2.amazonaws.com/secure.notion-static.com/cf33661a-17c5-4aed-9855-971167160c8a/untitled
Export the image. And there you have it.