A few additional shapes I’d like to see added:
Inverted Ramps - Where the underside is what is intended to be seen, for the undersides of buildings.
Alternatively, would also like to see ramp wedges (regular and inverted) and inverted ramp corners.
Roofs and ramps, for triangle ceiling/foundation corners (where 2 triangles or a triangle and square tile meet) Currently there is only the one, right angle, but triangle pieces use a different degree angle in their corners.
Triangle pieces - (both ceilings and foundation).
Isosceles right triangle - to fit between 2 square pieces.
narrow - to fit between an equilateral (current) and square tile .
Angled fence rails, that can be placed along the edges of ramps and stairs.
Fences without the wood beams protruding.
Additional building material:
Interior walls - walls that have the same texture on both sides
Marble - Very smooth, possibly with swirls of color, and may be chiseled to have decorative designs in them.
Chiseled - similar in nature to warpaint, but with different aesthetics, and decay rates.
Edit: added ramps/roofs corners for triangle corners