For my world building class, I created a dystopian sci-fi world inspired by The Little Match Girl.  I imagine the world as a frozen wasteland, which it became after a natural disaster dubbed "The Great Freeze".  The rich created a utopian society, while the poor are left in the freezing cold.  The world has two primary locations - Polaris, the frozen slums of the poor, and Hearth City, a highly technologically-advanced city that uses red heat-emitting crystals to provide power and warmth.  For this world, I created various different props and buildings to match each setting, with Polaris getting more worn and torn items that generally lack technology, while Hearth City gets more luxurious objects and clothing.