Canon offers a huge variety of papercraft animals, toys, vehicles and architecture. There may be something here for your miniature wargames.
Paper Models
Wild West Paper Buildings
Shadowwolf offers a nice set of paper models of Wild West buildings.
Mecha Paper Standups
For a large selection of paper standup models of anime style mechs, click on the link.
Lunch-O-Matic Restaurant Paper Model
The Lunch-O-Matic is a cute little stand alone building that houses a down-on-its luck diner. The paper model is free for the downloading.