Those overpasses, including their color, look much the same as any other. If you want a unique color,
I'd say the ones outside the Miami Football Team's stadium qualify, even though they repainted one of them that used to be in a "coral" color to match the other color in the team's uniforms.
Or, for something fancy in a different way,
the bridge supports at the junction of I-70 and I-75 near Dayton.
Of course, neither of those is in the middle of nowhere.
Perhaps what tolbs17 is getting at in the original post is that both North and South Carolina seem to have a lot of much older overpasses (stuff like
this or
this) such that his beef is more with the newer, more modern overpass seen in his original post? If that's the issue, I'm sure it's just a function of an old one having to be rebuilt or replaced such that the reconstruction is to current standards. That's hardly unusual.
Note the funky-looking older guardrails on this overpass in Virginia. The next interchange to the north used to have the same (and still does on one overpass, though they aren't green), but when the flyover ramp there needed restoration
they replaced those guardrails with boring concrete barriers.
Unfortunately, monolithic boring sameness is often a cost of "progress."