User dexaler on Reddit created this covert cabinet with multiple secret compartments in his kitchen. When closed, you can’t tell there is any storage there. But you can flip open a couple rustic boards and reveal easy to access goodies inside.
There are a lot of ways you could make something similar using boards or other panels that fold out to allow access to storage. You can even recess the cabinet into the dead space in the wall if you happen to be on an interior wall. It looks like dexaler has a little interference with this current faucet that doesn’t allow the bottom panel to drop all the way flat. This can be solved a number of ways. Be sure to plan for any interactions like that when designing your own cabinets.