Update: now with added gradient shadow paths to be more useful.
This is a very basic one.
Basic, but useful.
It allows you to add a shadow using the pattern tool. This means you can create any shape you like. However unlike other shadow options it will always have a hard edge, so best used for objects with hard edges. Being a pattern it can also be used with layers.
You can now use the included paths for soft edges i nany situation you can draw a path along the outline).