I personally found the orange to be harsh when playing for long periods.
Set Logistic zone to light purple (91,67,160) and the Construction zone to blue (65,108,120), much better.

Thanks for making!

I might add some Preset colors (the list would be set to "Custom" by default and use the color pickers, but you could choose some others from a list).

The hard part is finding pairs that look nice. You're welcome to post suggestions.

Presets would be cool.
To find pairs, search online for 'colour wheel' - colours on opposite sides of the wheel, or next to each other are pairs that go together - useful bit of colour theory there!
Not sure if links are allowed:
https://imageframer.net/articles/how-to-use-a-color-wheel/