I have grey shades in my carpets, charcoal grey countertops, and some of my flooring. It is a great neutral color that goes with everything. I have a wide assortment of other colors all through the house. I have lots of antiques of various browns. I have had these greys in my house for 14 years since we built our house. No regrets. I prefer it over beige.
Now with my grey hair, and that of my dog's, I guess I am starting to look like my house. ha ha.