Change Grid Color
Define the keyword in the setup file user/Setup.
A direct color setting sets the color from the Vertex color table.
Keyword set.vertex.gridcolor = <color number>
If direct color setting is not in use, you can select a grayscale color. These run from almost black (-15) to almost white (7).
Keyword set.vertex.griddimmer = <-15 ... 7> 7>