Running a close second to coffee cups are plastic drinking cups.  In Jerusalem, if you buy a beverage in a bottle you are invariably asked whether you want a plastic disposable cup as well.  If you say yes, chances are you will be handed 5 of these cups for a 1/2 liter bottle.  No wonder they are all over the place.  I think they can be very beautiful depending on what is in them and how the sun is shining.  I don't touch them or move them - they are photographed as I find them.