Toposolitario has a new paper model for you to enjoy: a science fiction ornithopter. The artist points out that a 50% printing, it would work for the now very popular 15mm science fiction figures.
paper model
Zeppelin Goldola Interior Model
Rattrap Productions has a free paper model of the interior of a Zeppelin gondola, suitable for 28mm figures.
Steampunk Mecha Paper Models
The Toposolitario site has a nice selection of paper models of mecha suitable for steampunk, pulp or wierd WWII games.
Wagon Paper Model
Fat Dragon games offers a free 3-D paper model of a small wagon.