'The Dark Crystal' is on my Top 10 Favorite Movie list. As much as the thrill of imagining sequels and prequels is, I say let the film stand alone.
With that said, here's a post about the new Prequel novels being written.
This past summer, J.M. Lee released the prequel book "SHADOWS OF THE DARK CRYSTAL". It was apparently the first in a series of Dark Crystal prequel novels. And had a sweet cover.
The second in the series has now been announced, titled "SONG OF THE DARK CRYSTAL" (set for a July 2017 release). Posted at the top is the book's cover art.
I haven't read "Shadows of the Dark Crystal", so if anyone HAS, please let me know your review!