'1,001 Nights of Snowfall' can function as a standalone arc within the 'Fables' story, but I followed some advice that it should follow 'Mean Seasons'.
The premise is that years ago, in the 19th century, Snow is sent as a emissary from Fabletown to a Sultan of the Arabian Fables. His court is offended at her ladyness so she is imprisoned and then sentenced to be that night's bride. The Sultan marries a new woman each night and executes her at dawn. Snow is wise enough to play Scheherazade and entertain the Sultan with stories of her homeland.
Not only does '1,001' offer the chance to explore the origins of more Fables, it offers a break from the hurtling conclusion demanded by the Adversary's initial invasion of Fabletown in 'March of the Wooden Soldiers'. Its an effective story and leads nicely into Boy Blue's adventures in the occupied homelands.