Be advised that because of the way the game renders moon images in the sky, sometimes the Borg cube will appear to have a black circle behind it.  This will be most noticeable when the background sky has light shades in it, as it will in many of my nebula textures.  There is nothing I can do about this.  When the cube appears against a very dark background, like a star field with no nebula, this circle is not noticeable.  So please keep that in mind-- sometimes it will look funny.