Here's a great round up of fan art comparing the Game Of Thrones TV characters to their actual book descriptions.
Some of the characters vary wildly from book to screen with Tyrion Lannister's on page description including deformed legs, a bulging forehead with different coloured eyes and a missing nose which he lost in the Battle of the Blackwater. Daario Naharis on the other hand (directly below) has blue hair and beard in the books. Head over to Dorkly for the rest.
Ser Davos Seaworth
And of course the Iron Throne itself.