Here’s are some 28mm scale paper models of the facehuggers from Aliens.
Paper Models
Free Paper Models: Laboratory or Alchemist Equipment Models for Your RPG!
For furnishing your dungeons, here is a set of models of alchemist / laboratory equipment free for the downloading.
Paper Table Models
The “D4 D6 D8 D10 D12 D20” gaming blog has some free paper models of wood tables for your D&D, fantasy or medieval games.
Free Dungeon “Furniture” Downloads
Stock your dungeon with Heroquest style furniture! There’s lots of good stuff here for a wide variety of periods for skirmish battles.