These are not very flashy but they are useful and 'no one' makes these, so here goes.
Floor segments with bits missing, that way they can be put together to form either floors with holes or walkways of irregular shapes, like for causeways etc.
floor segment 'sheet' with no depth, same goes for walls.
various billboards, as in street billboards
large flat sheets as entities in different sizes, useful for putting in the background, so one can put images on them for distant objects, so for example one may put images of buildings on them for distant building or a volcano or crashed space ship or whatever, rather than using a model with loads of ploys in it, but of course one could put any masked texture on it really, very usefull.
And a personal model Ive never seen done.
A low poly stadium, (straight section, diagonal section, and a curved section so one can stick them together in sections to build a curve or circle ) and in the seats put long flat sheets (or a curved one in the curve section) stretching across each seating area, that way masked textures of a crowd can be put in them.
