In the books, the Iron Throne is gigantic, made of a thousand swords and with actual stairs you have to climb to reach the seat. For the purposes of Game of Thrones, the show's producers decided to with something a little more realistic. The throne on the show is made of more practical materials like resin and paint, but it does hide some pretty awesome Easter eggs—if you know where to look. When the prop-makers were creating the throne for the show, they reused molds of swords from other productions along with generic ones. If you look closely, you should be able to spot Gandalf's sword, Glamdring, from the Lord of the Rings films, as well as swords from Robin Hood: Prince of Thieves and Kingdom of Heaven.
In the Eyrie, the weirwood throne upon which Lysa sits and dispenses (her idea of) justice was given lots of care by the production team. HBO revealed in its Season 1 production diary that the prop is made from three pieces of wood welded together, and it is so massively heavy that it required a crane to move it into place. In Season 7, we're going to get our first look at the throne at Dragonstone, the ancestral Targaryen seat. The show's set developers chose to model the Targaryen throne upon the amazing flysch rock formations found at Zumaia in Spain, where part of the Dragonstone filming took place this year.