The Lego Treehouses
There is a version in the Friends collection, but how about a more mature range of interesting architectural designs within the confides of a tree?
Each one can come with unique extras such as a tire swing, draw bridge, fireman's pole (in a hollowed out tree-trunk), or even a rope-bridge.
The minifigs could be both human as well as nocturnal animals such as Owls, Possums, Squirrels and Bats.
One set could even include a slide from the Tree-house, spiralling around the trunk and landing at the base.
I will add more designs as I .... design them.