Back in 1982, I was working on a college campus and met with three students. All three students walked in with grey Cowboy Boots. They said that this color was what was "in" on college campuses these days. Those boots on the boys looked great, so I went out and got a pair made by Justin. This pair is shown in the first set of images below. They looked great until I fell up a flight of stairs and scuffed them badly.
A few years later I updated my inventory with a quality pair of grey Boots made by Lucchese. Truly comfortable, and look good with a business suit as with denim jeans.