How to make a Floating Shelf with a secret hidden compartment. Hidden compartment can be opened without removing any display itms from the shelf.
If I ever have to live in a very small space :)
Window Sill Hidden Drawer (open)
Discreet Wind Turbines ... now the neighbors can't complain! (Neat idea, not sure our house is facing in the right direction to make this feasible, however)
Hot Tub / Spa Enclosure. Looks like it might have room for a sauna.