Once Toady gives boulders the "Make houses out of boulders in Adventure Mode" functionality that I think he intends to do, as opposed to the current situation where they're mere decoration (albeit that, back when we had trader wagons, they were also wagon-pathing barriers, needing smoothing away), I could see boulder-landscapes.
Although I think that boulder-fields deserve to be a "soil type", and perhaps moreover one that will cave-in with no Z-1 (or Z-1 and X/Yą1) support, and no mamby-pamby hanging off of similarly composed material to either side for dozens of X and Y tile distances. And materially as useful as normally mined stone (for small to medium-sized things... not sure if you should make tables out of them[1]).
Incidentally, I've walked over boulder fields (and scree slopes, which maybe should be considered similar, or an alternate interpretation of a similar surface but on a slope) of various sizes, some almost "large pebbled beaches" and resulting from recent flood-water activity, through to truly boulder-sized (larger than those shown) in areas left behind by glacial activity, and I can show you a few spots in the Pennines (England's "spinal" range of hills) where a similar effect has been created by both natural and artificial quarrying away of an "edge"/hardstone cliff, with the resulting rubble/unwanted spoil-pile being laid along the various valley bottoms involved. The more troublesome of these don't actually look like a boulder-field, because of the verdant nature of the plant growth over them, but try walking on them without care and you're liable to get a twisted ankle, or worse.
Sorry, probably far too much chatter, there. TL;DR; = aesthetically it could probably be done, but I think there could be a useful aspect to making it functional.
[1] For this, it would need a revamping along the lines of those prior suggestions that better skilled miners can extract better-quality raw stone, pulverised stone from any-old-miner being good for smelting and other minor purposes, in an area designated for quick and necessary digging, but for stone thrones you need a particularly good miner and a quarry-quality stone-digging designation to extract large rocks. In-between there's rock chunks good enough to make mugs, etc...