Quite possibly! A central world with two poles, white and black above and below, the center has RGU and a dreaming elder dragon causing disturbance - That'd be interesting in terms of geography, at least, and could still accommodate any individual conflicts people want between colors.
On a different note, some people seem to want a library theme, but I'm unsure exactly how that ties into the dreams, flavor wise. Do people have existing keywords in mind? How would the "Dreamworld" be mechanically represented, and how would it be different than "Reality"? I like enchantments better mostly because enchantments and flipping makes it easier to mechanically represent the separation between dreams and reality and make the divide very clear, but if a few good keywords can make a library theme work, that'd be cool.