Have some money or jewelry you need to stash away? The somewhat-Bond Hidden Wall Safe will do the trick. It looks like an ordinary outlet but has a mini-safe tucked into a compartment behind it. It is easy to install and measures 7" x 2.5" x 2".
Where to get it? Amazon has it for $4.45 plus $5.90 shipping (it is shipped through their partner "As Seen On TV"). That $10.35 shipped is the best net price for one. Also worth a look: Stacks and Stacks has them for $7.99 but you can 4 for $31.96 plus $6.45 minus $5 off $25 coupon code "WL5off25" through 11/15.
Fake electric oultets not your thing? Try the Can of Dr. Pepper Safe or the Book Safe.