If you want to really screw with people, then just turn off the lights xD
That's the way the DR is for me with shaders on low anyhow

You know what would be cool ? A flying creature that grabs you from behind with its claws, flies around at random and drops you somewhere. ( perhaps just in one or two spots so as not to kill RP )
Like those disembodied hands from the Zelda games that come out of the walls and take you back to the beginning of the level? It'd work best if it was randomized, or else it'd feel too mechanical, like the current NPC routes in the towns.
Speaking of Zelda, the Lost Woods levels were always like this. You would have to know the proper sequence to get through them, or else you'd keep looping back to the beginning.
How about a room full of Escher Stairs?

Loving these ideas, keep them coming

If there's ANY part of this game that should be mysterious and convoluted, it should be the DR.