I remember when I first put a D7 model together (probably AMT), I wasn't satisfied with the color. So I painted it glossy black. It looks downright scary that way.
Back in the 1970s I built two AMT Klingon kits. The first one came molded in light gray plastic and looked very similar to the TV version. The second one, from much later in the decade, came molded in black. I was stunned; I don't recall the package announcing it. They just switched to black plastic.