Disclaimer: I'm not a farmer. I don't speak for farmers. I have accidentally killed mint plants... twice. You don't want me anywhere near things that grow.
With that out of the way, the few farmers I have known, have been ultimately practical folks, almost to a fault. The types who "accessorize" where the color of the hat has to match the color of the shoes are IME, much more urban types. I can't possibly imagine any of the farm folk I know jumping on a green knife just because its the same color as his tractor. I COULD see a farmer going for an orange, or yellow (like Salt series) color for easy visibility which actually could make a difference to function (easy to spot and harder to lose). In the case of those bright non-natural colors, they could actually enhance the usability of the knife and provide a measurable practical advantage.
But making it green so that the knife color matches a John Deere tractor? Something tells me the only people that would sell to are the wannabe-rednecks. You know, the type who drive the jacked up F150 with confederate flag sticker in the back window who park in front of Starbucks.
Again, I refer you to my original disclaimer. If farmers are more likely to accessorize than I think, I am willing to stand corrected.