Stone blocks, some carved to depict various dwarven statues; a couple modes of transport (a black gondola and a zurkhwood rafft) and some dead troglodytes. These files have a few more custom assets to fill out peculiarities of the undermountain.
As with all my Cartographer files, the zipped folder below includes the Dungeondraft asset pack, the DD map files, and the raw asset images and pngs.