Squirmydad has a paper model of a post-apocalypse armed and armored Winnebago.
Paper Models
Canon Papercraft
Canon offers a huge variety of papercraft animals, toys, vehicles and architecture. There may be something here for your miniature wargames.
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.