A judicious use of color accenting various horizontal rectangles.
Twin stacks in gunmetal blue with a white outline. If you click to enlarge, you'll notice a faint bullseye effect as well.
This one probably started as another example of the ubiquitous double horizontal rectangle, but not only the addition of a central divider but a hint of red makes this door unique. Note the slippers at the driveway's edge. A clue?
Here we see the fine line between a rectangular design and bars. Two satellite dishes??
A variation of the above, on garbage pickup day.
Wouldn't you know it, just when I'd claimed the "slug trail" design as a one-of-a-kind, up crops another, this time with earthtones and the standard gratuitous patriotic embellishment.