I love, love, love grey. How about an entire grey outfit? Sign me up. I know I've mentioned [for wearing all black] to make sure the textures are different. With grey, I think that's a fine idea, too. But, not crucial. Try pairing different colors of grey together, in place of or along with. Even if it's just a shade off. I think that keeps the outfit interesting. Here, I added silver [more grey!] jewelry which really amps it up!