I know the Essie "After School Boy Blazer" is not a muted tone but I couldn't resist including it because it is still one of my absolute favorites.
The Sally Hansen and Wet N Wild polishes are both truly neutral shades. However when I do what a little bit of color I currently love the Rimmel "Soul Session" with is a pretty pink-taupe, and the Essie "Merino Cool" a purple-grey shade. These shades are perfect for when you're looking for something more than a nude shade, but not a stand out shade.
(p.s. sorry it's been a while since my last post. Work has been crazy hectic that by the time I get home.. I'm a zombie.)