The stones were carried down the walls in an irregular fringe for a few feet, where they appeared to hang like a beautiful and gorgeous drapery... In that single room was a vast treasure equal to the wealth of many a large city.
This isn't at all a literal illustration of the passage (although that might be worth trying too, at some point) but I think I've made some progress with the ridiculous-numbers-of-jewels-set-into-the-wall effect.
Maybe I need to try something with some natural symmetry. One of these days I will dig through my folders of formulas, and find one with a nice repeating tangent function or something, that will give me a series of arch shapes.