The simple question is:
Who is the color-blind one in this forum?

But perhaps your monitor is broken or something like this.
VOY Borg ships consist of rather matte metal and green lights.
How green, black or silver they look depends on the intensity of the green lights and on the matter if there are other light sources (nearby stars, planets reflecting light, glowing nebulae) in proximity. Black/green if there is no additional light, grey-silvery green if there is a sunlike star nearby.
And believe it or not, with an red light source around, the Borg ships would even look red!

Fantastic, hm? The magical world of color and light. Unbelievable.