If we're getting into literary recommendations, I have one to make.
If you'd like to read a literary description of the Far Realm itself, and what it truly means to go or "exist" there (so to speak), I cannot recommend highly enough that you hunt down a copy of a story written by H.P. Lovecraft and E. Hoffman Price. "Through the Gates of the Silver Key" contains the single best description of the Far Realm that I have ever encountered, and that includes the description in 3.0 Manual of the Planes (although the MoP description is certainly more evocative in terms of imagery).
It's a rare story; most collections of Lovecraft stories don't include it- but if you find it and read it, you will understand what I meant. And to a large degree, why the Far Realm drives people insane.
On a personal note, that story is also what led me to postulate that Uvuudaums are essentially the Platonic "perfect Forms" (or Archetypes, in the philosophical sense) of various types of real people. That, in turn, led me to create NPCs like
The Paladin, which showed up in my own campaigns several times (and were always quite memorable encounters to the players when they did).