The Borg just look good.

They look great, they�re very black and white. They�re kind of retro in a sense. The interesting thing if you look at the Next Generation is that the uniforms are all very primary colours - red, green and blue and so forth. The Borg were black and white and that was kind of an interesting contrast that made you, I think in a subconscious way, think back to some of those terrible 1950s zombie movies and the scariness of the undead. They had that pallid look of a corpse which added to their creepiness.