I swear when I first saw the thumbnail, I thought "Cool! This must be part of a scene from the new Game of Thrones - Season 2!" Maybe House Greyjoy or something. Hahah! ^_^ Have you ever seen the opening? It has self-building empires, made of blocks, just like this one.
This is a very cool piece of art, congratulations!
I've never tried fractal art, I don't know how you do this and I don't know the programs you've mentinoed (except Amazing Box), but I can imagine what hard work it must be, especially for the tiny details in this piece! it looks simply magical... *gets lost in it*
I just can't get my head around home you people use these programs to make such incredible artwork. This looks like a science fiction scene that took months of 3D rendering. You are truly a master of this medium.