If you ever go geocaching in the US you will almost sure find many of the under the Skirt type of caches, they can come in all different shapes, and even sizes, but the on thing in common is they are hidden under the skirt. Let me share an example:
A film box under the skirt...
Just for those who do not know what the skirt really is here is an image when the cache is not visible but the skirt is, Hiding the cace above:
This hiding method is popular all across the US, and mostly in shopping areas' parking lots.