Many years ago, an OHP friend of mine said they had "specially marked" trooper cars. These cars would be brown, white, or any color of the rainbow, but they had the Oklahoma Highway Patrol emblem on the side ...
I once saw a maroon OHP unit. Yes, I said "maroon." A Chrysler Diplomat, no less. Talk about an ugly car. I think it had the white doors and the old school bubble gum machine on top, but I can't recall for sure. I saw it just south of Ponca back in 1988. I was visiting a girl who was stunningly attractive despite (or because of) her slightly bowed legs. But that's another story.