This custom trophy mount pedestal from Wicks Custom Furniture includes secret drawers in the back behind a hidden door that can store up to 4 rifles or shotguns.
A user on AKFiles posted these pics of their Pepsi machine that they gutted and turned into a secure gun safe. From the outside no one would suspect anything other than tasty beverages filled this machine.
This coffee table from Walmart includes a secret long-gun storage compartment underneath the lift up top. The cabinet is fully lockable and contains two pull out drawers as well.