I wanted to find a cool gray nail polish that still retained that muddy look.
I found China Glaze Recycle.
I have used several muddy tones of polish, like Essie Chinchilly and OPI You Don't Know Jaque. I found this shade of China Glaze to be basically the same as Chinchilly with the slightest difference being that Chinchilly is a bit more brown.
Because of my pale complexion, I was hoping to find a little lighter of a gray, but so far...the search continues.