>>7526162Oil. Put down some dots, smear it around in hopefully suitable ways.
>>7526165If you want to keep the effect a bit muted, maybe do something like "the day after", with drifting sand or snow or some such having partially covered things. So at first you see a number of lumps here and there in the ground, and then you realize what all of those lumps were before they got shot. Somewhat in the spirit of this, just a ship sailing about at first glance, but...
