Game of Throne fan designers have been busy! There is a slew of great GoT designs on Spoonflower and Shapeways, many of which may be of interest to costumers. Here are the GoT fabrics I've found on Spoonflower, let me know if you run across any more:
Oberyn Martell's yellow paisleys
Dany's Qarth Belt
Dany's Quarth dress fabric
2 versions of Dany's other Qarth outfit (that came in pink and blue the the metalwork collar)
Margaery's wedding Dress
Just a word to the wise - always get a few different fabric type samples before ordering yardage from Spoonflower, certain designs look much better in certain fabrics.
Shapeways has also come through, there are many repros of findings and jewelry are available, as well as come cool original deigns. Here are a few of my favorites:
Targaryn Sigil Ring
Dany's cloak pin
Margaery's Rose belt
Margaery's belt clasp
Margaery's Wedding Pendant
Cersei's Lion Pendant
As always check sizing an material on Shapeways before ordering.