Most all of us have some magical memories of playing in a tree house as a child. Here are some wonderful examples of great tree house designs that redefine the word tree-house and would be better suited by the title "canopy cottage." Why not go out on a limb and build one at your house?
Via Home and Garden
via Abby Sharp Tumbler
Sorry, cant remember where this image is from.
image Credit: SQN120@flickr.com