Back and forth they went, never seeming to hit a long, smooth patch, together or separately.
A black snake was sunning itself on a smooth patch of rock.
I pressed my ear to a smooth patch of hull.
On the surface of the water there was suddenly a smooth patch, as though a large fish had dived.
They circled low, searching for a smooth and level patch of ground on which to land.
Anybody walking but not looking wouldn't notice the smooth patches.
There's a smooth patch of what I hope's snow at the other end of town.
There was the occasional smooth patch of obviously new metal.
The new scar was a smooth patch of pink above her small breast.
A dark smooth patch in the lower right corner may be warm ice that recently welled up from below.