Random irrelevant fact: I hate the Fifty Shades books. I would rather read about the chemical composition of earwax and bogies.
Despite this, I really like O.P.I.'s Fifty Shades of Grey collection. There are some greys, a beautiful red, a silver and a teal blue. I will swatch the whole lot for you shortly. More on the polishes I used below.
Within minutes of the base colour drying, this happened. Nice.