Awesome! And I agree, altering or additional tile stuff - if any - fits better into q_tilesets (or q_!tilesets), like the desert dunes and oasis.
q_!tilereskins.hak will be a new optional hak available through Project Q. It currently includes the Granite Dwarf Halls, Granite Crypts, CTP Dusty Dungeon, and _Six's Desert reskin in one convenient package.
For Builders that do not wish to use all four reskins, I have included the individual source files as 7z archives. You'll find them in the /source folder of your Neverwinter Nights installation once Q v2.0 is live.
This also brings me to another possible optional reskin to include...Winter TNO.