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Not entirely dissimilar to my own pattern generation tool, https://trianglify.io/

How are you doing the color palettes? Is it fully random or using some kind of picker algorithm?

Completely random. It picks a hue value (0-360) and then adds or subtracts a second random value from this for each layer. The maximum value of this increment is relatively small, so the colors are usually similar within the same image.

Love it.

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