Concept: Braces that allow you to "build" a structure like a house by "snapping" together various lengths and strengths of metal braces like linking logs to create the frame of the structure.
Standardized Lengths: Braces (and the structures they build, by extension) would be offered on a standardized system (eg. braces would come in lengths incrementing by 6" starting at 6" and extending to the longest length that maintains its structural integrity).
Extensible System: Braces would then have notches to snap in insulation panels in the cavities of the frame and decorative drywall/wood/brick panels to the outside. They would also have pre-drilled holes every so often to run wiring and plumbing through.
Use Cases: Rewiring a house is as easy as snapping off the decorative panel, stringing your wiring through the necessary holes and snapping the decorative panel back on. Changing the aesthetic of a room is as easy as purchasing and snapping new panels to the frame. Adding a room to a house is as easy as snapping off a wall and snapping together a new room off the side.