Although I know the FBG Fallen London store is full of great stuff to sell, I had an idea for another type of item that could be a big hit.
Christmas cards! Specifically, Christmas cards with the four designs featured in the "cards" we exchange in Fallen London: The Paint Splattered Mog; the Predatory Vegetable; the Fogscape with Tentacles; and the Suspicious Sort. Great fun to send to all your real world friends who play the game, and amusing even as to those friends who have never heard of Fallen London (i.e., the ones living under rocks).