An alternative to chlorine pools, the BioTop Natural Pools use plants to keep water clean and clear. Wikipedia has some more info on natural swimming pools as well. These could make a great addition to a permaculture design site.
diy natural swimming pool - the plant zones on the side of the main swimming area filters the water, no need for chlorine, salt, or bromine, and the critters and aquatic plants can enjoy the water too!
Container House - Shipping Container -- I could totally see living on the bottom, kids on middle floor and adults on the top with balcony. - Picmia - Who Else Wants Simple Step-By-Step Plans To Design And Build A Container Home From Scratch?