DEC
PDPs weren't that wild, but the 8 and the earlier 11 models would have the filler front panels in black, the topmost panel half red, half purple, and of course the CPU panel with a row of red and purple toggle switches. The DEC10 and early VAXes were mostly light beige but with blue accents, the DEC20 was beige with reddish orange. Later VAXes were beige/brown (ugh). And then Bob (spit) Palmer changed the filler colour in the [D][I][G][I][T][A][L] emblem squares from blue (and it had been black before that) to burgundy (more ugh).