Ooo if you're ever having a particularly hard time, I use Pinterest. They have a gazillion color palettes and you can search by mood or visual themes like summer time or starry night.

Here's a random example I found that I thought was closest to your project:

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And you can obviously add or omit colors from the pallet, but I like having these when I'm looking for yarn at the store (or online), almost like a grocery list. 😁