In wall gun safe mirror
Picture of Hidden in wall Gun Cabinet with Hidden keypad. Good for things, other than guns, too.
Gun Cabinet by Paul Silva
Hidden Gun Compartment Behind Sliding Wall Grate. Could also put grate on a piano hinge for easy opening. Good way to hide a weapon in a convenient, but overlooked location. Place them throughout the home.
How to Install a Decorative Wall Niche | This Old House
Would love this if we didn't have a 600# safe. 1450: Black Frame w/ Mirror Cover (Open) and Black Insert
Cabinets and Safes 177877: Pistol Cabinet In Wall Gun Safe Storage Drawer Security Lock -> BUY IT NOW ONLY: $34.8 on eBay!
Stack-On In-Wall Cabinet, Beige kind of cool, I didn't know things like this existed til I saw the idea on pinterest for DIY in-wall things