Pages released from the official Game of Thrones Coloring Book are beautiful enough to get George R.R. Martin grinning.

Martin, author of the A Song of Ice and Fire series on which HBO’s Game of Thrones is based, seems amused by the concept on his Not-A-Blog.

“It seems that of late adult coloring books have become quite the thing, so [publisher] Bantam wanted us to do one too,” Martin writes. “And since I love seeing good fantasy art, I was of course thrilled by the idea.”

The Game of Thrones Coloring Book was announced in June, and includes illustrations from renowned fantasy artists such as Yvonne Gilbert, Tomislav Tomić, Adam Stower, and Levi Pinfold. John Howe, who is especially well known for his artwork for the Lord of the Rings trilogy, also provides several drawings.

“I have seen the (uncolored) art for this one, and it looks spectacular,” Martin enthuses. “Probably will look even better once colored. So stock up on your colored pencils, boys and girls (or your crayons, if you dare), you’re going to need them.”

Entertainment Weekly has an early look at a few drawings from the Game of Thrones Coloring Book, featuring an epic flight of dragons and what looks like the Red Keep of King’s Landing.

The artwork is clearly intricate and well-detailed, and is sure to provide an entertaining challenge for fans looking to add a little more color to the lurid palate of Westeros.

The Official Game of Thrones Coloring Book will be available on Oct. 27.