I came across a blog done by a lady who makes little fairy houses from objects from nature when she goes hiking.  She then leaves them there for others to find.  She does this with her children and I think it is wonderful.  Children really need to have more play using their imagination and what better way to do it than to build things for others to enjoy!  Sharing:

http://mountainhearth.blogspot.ca/2010/03/tiny-home-among-mosses-building-fairy.html