For some time I've had this idea of turning A Princess of Mars into an action packed adventure for the Warriors of the Red Planet RPG. There are a lot of challenges to doing that, primarily that the book is a 1st person account of a single warrior's experience and how to translate that into a party adventure. I look towards Gary Gygax's Dungeonland and Beyond the Magic Mirror modules for inspiration. I think it can be done.
So I had a little fun and concepted a cover for the module. If there is any traction to the idea I'll consider developing it further.