
I don't know if you know this, but I am a huge fan of The Dark Crystal.
Ok, that's a paltry attempt at humour. If you read this blog at all, you know that I hold The Dark Crystal up as the greatest example of true fantasy that has ever been created. I have written before about the astounding amount of creativity that I feel went into this film. Tolkien did something wonderful when he created Middle Earth; he took elements of existing mythology, added many of his own ideas, and blended it all together into a cohesive (and incredibly well-detailed) world.
Almost all fantasy (excluding 'modern fantasy,' obviously) has followed on that pattern to some extent. Some fantasy worlds do away with non-human races (like Game of Thrones), others add or remove or alter some non-human races (Earthdawn added the Obsidimen and T'skrang, for example), but they're otherwise all more or less the same basic idea of pseudo-medieval settings with magic.
This is not the case with The Dark Crystal.