The Real Iron Throne according to GRRM:

The HBO throne has become iconic. And well it might. It’s a terrific design, and it has served the show very well. There are replicas and paperweights of it in three different sizes. Everyone knows it. I love it. I have all those replicas right here, sitting on my shelves.

And yet, and yet… it’s still not right. It’s not the Iron Throne I see when I’m working on THE WINDS OF WINTER. It’s not the Iron Throne I want my readers to see. The way the throne is described in the books… HUGE, hulking, black and twisted, with the steep iron stairs in front, the high seat from which the king looks DOWN on everyone in the court… my throne is a hunched beast looming over the throne room, ugly and asymetric.

Marc Simonetti has come closer here to capturing the Iron Throne as I picture it than any other artist to tackle it. This Iron Throne is a throne made by blacksmiths hammering together half-melted, broken, twisted swords, wrenched from the hands of dead men or yielded up by defeated foes… a symbol of conquest… it has the steps I describe, and the height. From on top, the king dominates the throne room. And there are thousands of swords in it, not just a few. This Iron Throne is scary. And not at all a comfortable seat, just as Aegon intended.

(Source: art.marcsimonetti.com)