There are a few different ways to obtain an Iron Throne. The recommended method is to ruthlessly conquer your cowering enemies over a period of many years, capture their swords, and forge them into the shape of a terror-inducing throne full of fear and sharp edges. An easier way is to start with a plastic lawn chair.
Instructables user "flaming_pele!" began with a white, plastic Adirondack chair on his way to building a "Game of Thrones" Iron Throne that could handle party guests in chain mail. Other materials on the list include foam insulation, wood yardsticks, craft foam, duct tape, metal tie-down strapping, and plenty of metallic paint.
Flaming-pele! also constructed an elevated base with stairs for the throne, lending it more of an imposing look and requiring visitors to supplicate themselves in front of it. The yardsticks form the basic shapes of the swords with foam insulation added to create the blades.
The bulk of the project is forming enough blade shapes to make the seat recognizable. Latex caulk smoothed over the sword surfaces gives the melting effect. After that, it's about priming and painting for that ripped-from-the-hand-of-a-dead-foe look.
Once completed, the project reaches more than 7 feet in height, enough to impress your subjects as you rule them with madness, disinterest, or sociopathic rage, depending on which king you model yourself after. Have fun!