The ground was covered with the same slimy, gray mud.

The ground was now muddy and deep, my shoes caked in pounds of grey mud.

She disappeared into it as if being swallowed by gray mud.

Their track, like the jungle floor, was grey mud.

The rock was covered in a thin sheet of grey mud.

The gray mud and lava of the invasion days is now covered with soft grasses.

The burst coated cars and town houses with sheets of gray mud.

A bank of grey mud, about six feet wide, shelved down into the water.

I've got the same gray mud at my house.

She held up a custard cup containing what looked like gray mud.