Of all people, my wife was the one who showed this to me the other day.  It's a company that designs concealment safes for your firearms for home defense.  I'll be honest, some wouldn't work with a family with children, but others look pretty secure.  Take a look at the video.

They also have concealement wall mirrors, clocks, and more.

They are a bit pricey ranging from 300-500 dollars, but for a gun enthusiast that really isn't that much to spend.