There was no color, just the constant monotony of rough gray concrete.

Not much to look at, just gray concrete and pools of light and shadow.

On the left sprawled more modern buildings, of gray concrete, white masonry, and glass.

Four walls, a ceiling and a floor, all drab, grey concrete.

What dominated the room was a column, four feet on a side, of gray, rough-finished concrete, going from floor to ceiling.

The worst gash was about 3 feet long and a foot wide, inside one of the blue lines, where gray concrete could be seen.

The left wall was a blank expanse of gray concrete.

Off to the left of the screen I could see the gray concrete of a highway.

The dirty gray concrete of the floor was ever so slightly higher in that small area than anywhere else in the basement.

Through a metal door, you enter a tall chamber of gray concrete.