Folgers Coffee displayed a pretty creative guerrilla marketing campaign by covering the city street's manholes with images of a top of a cup of coffee. When the steam rose from the sewers below, it appeared that a fresh cup of coffee was steaming up.
Guerrilla Marketing Papa Johns Pizza I almost could go either way with this one. It's funny and memorable. But because it blocks the actually view and the door would have to be opened to see who was there, it could backfire and be dangerous.
Here's an oldie with a twist. Use pieces of garden hose or other tubing to soften the jaws of slip-joint or other pliers so you can grip plated surfaces without damage. The twist? Size them so you can slide them up the handles to keep them handy.