Toposolatario offers IKubes -- paper models of mass produced building modules from the distant future. You can quickly make a few dozen of these in different colors and decorations to completely fill a game table.
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This free paper model of a Roman villa seems to be somewhere between 15mm and 20mm size. You could scale it on your printer, though to make it work in other sizes.
Given the absurd prices on Warhammer 40K Titan models, this paper model of a Warhammer 40K Chaos Warhound Titan may be just what you needed.