Drow do not have grey skin. Period. They're not duergar. Keep the current shades as options for players I guess, but it's ridiculous to me that this is an official D&D game and they don't have ebon skin like they're supposed to. They aren't purple; they aren't grey. They have jet-black skin. I know the game is incredibly far off, so please give this option down the line as it's the correct move.
Per the Forgotten Realms wiki,
The skin of the drow was dark grey[24], jet-black[22] or obsidian[15] (with shades of blue).[9][23][21] An exception were the albino drow, the Szarkai.[22]
Note the wiki references, and the specific books mentioned.
