I know that they are evil garbage, but I think plastic bags caught in trees or blowing gingerly down the street can be pretty. Obviously only as long as somebody eventually picks them up and the person who dropped them in the first place has frequent nightmares about their envirocrimes!
This is a photo of The Rise Of The Fall, an art installation by The Miha Artnak. You can find out more and see the project documented here.
Have a good week!