secret door to an underground storm shelter/panic room/hid out in the kitchen island! Best secret passage ever! Definitely a dream home feature! (would also be good if someone broke into your house and you had to hide somewhere) Zombie apocalypse.
Utilize space between studs to add shelving. This would be ideal down a long hallway. Add glass shelves and lighting for display or cabinet doors to hide stored items. Install adjustable shelves to allow for easy changes.