Books:

http://fyeahfantasywriterunicorn.tumblr.com/ - Meme for genre writers. 

http://fantastiquecollective.tumblr.com/ - Recommendations, crossovers and parodies.

http://neil-gaiman.tumblr.com/ - Official blog and the closest we get to Twitter-like interaction here in Tumblrland.

http://fuckyeahfictionalmaps.tumblr.com/ - Check the tags, exhaustive list of authors

Fashion:

http://fyeahnerdylolitas.tumblr.com/ - Check the tag list for frilly dresses and dragons.

http://dungeonsandfashion.tumblr.com/ - Dungeon and Dragons creatures and modern ensembles inspired by them.

http://whatwouldcerseiwear.tumblr.com/ - Inspired by Cersei Lannister. There are also sister blogs about Robb, Daenerys, Ygritte, Arya, Lyanna, Sansa, Jaime and Doreah.

http://dressingafantasyworld.tumblr.com/ - Fantasy costumes in visual media in detail.

http://sfffashion.tumblr.com/ - In-depth analysis of costumes and their symbolism in visual media again.

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r-dart:

 Hi everybody! I just wanted to let my new followers know I have a sketch book available. It’s a collection of Battle Kitten illustrations, comics, sketches, finished art, and an illustrated folk song, and some colour pages too. You can find it here: http://cinemasewer.ecrater.com/p/11881164/battlekittens-the-art-of-r-dart