Here’s a paper model of a Tori — the traditional Japanese gateway. You should be able to scale the model with software and your printer to fit your needs.
paper model
Paper Robot Model
What you really need is a giant robot to menace the heroes in your miniature wargames. You can get a nice paper model of a killer robot at Ravensblight.
Urban Gunstore Paper Model
Here’s a paper model of an urban gunstore. It would be useful in any number of modern urban warfare games.
Free Blood Bowl Pitch
The Gaming Corner has twenty different Blood Bowl pitch designs free for the downloading. Just print them out and glue the pieces to cardboard. The site also has Blood Bowl rosters and a quick reference sheet.