More than an invisibility cloak, I'd like to be able to "paint" my house with a programmable material that could change color/pattern.

So confused when I read invincibility cloak.

Minor thing but how cool to use this on pillars of cars and have total visibility ?

You don't need metamaterials. There are various patents on "invisibility cloak" systems, and most of them use screens and cameras to project what's behind the wearer onto the front-facing screen, e.g.: https://patents.google.com/patent/WO2016160588A1

Some others, mostly intended for military vehicles, aim to match surface IR emissions to the background.

Using metamaterials -- which need to be printed or, even worse, made with lithography techniques -- adds unnecessary cost and vastly increases complexity.