I haven't tested it after 4.2, but basically you have to take an item (any item) and place it on a flat surface like window top, stair pillar, etc, and use the quick swap method.

I'm not sure why anyone would want to hide this method to make their house special. If that's the reason you are doing it, then your creations aren't that impressive and only hinge on a trick and not actual creativity and design.