If you've tried Caver's Dungeon Crawl rules, you're probably ready to make some terrain. This page has some free tiles for constructing your own dungeons terrain.
Here's an outstanding paper model of an Aphid Aerial Gunboat. Based on a design for the late, lamented Space: 1889 roleplaying game, this is just the thing for your GASLIGHT games on Mars.
Peter Fitzpatrick offers this paper model for a 25mm - 28mm scale thatched wooden barn. This would be a useful bit of wargames terrain for many European scenarios.
If you're going to play miniatures games with Japanese monsters, you need some buildings for them to destroy. Here are a couple of paper models that are ripe for destruction by Godzilla, or Megalon, or Mothra, or whomever.
This is one of the best finds yet. Patrick Crusiau has drawn some absolutely gorgeous paper figures for use with wargaming. There are paper soldiers for Romans, Celts, Knights, Greeks and Persians, the American Civil War, the English Civil War, Science Fiction, Fantasy and Horror. The artwork is first rate.
Paper Tiger Armaments has released a free model of the Hetzer 38 T in 1/72 scale. This would be perfect fo r those playing their WWII miniature wargames in 20mm. But, since it's in jpg format, it is a simple matter to open it in an illustration program, and increase or decrease the size as needed. Thus, you could use it with your 25mm or 28mm World War II figures, such as those from Battle Honors, Wargames Foundry, Crusader, Black Tree Design and others.
Germ's World has a two sets of paper corridors for use as terrain with your wargames: a set of dungeon corridors and a set for science fiction. The sets include wall sections of various lengths, crossroads, junctions, staircases, archways, pits, traps and more. They are easily as good as many of the commercially available sets. You could use these for any number of games, including Games Workshop's Space Hulk or Warhammer Quest, WizKids' MageKnight Dungeons, or just a regular Dungeons and Dragons slaughterfest.
The Gear Krieg site has several Normandy buildings for use with your 15mm wargames. Paper terrain is a very easy and economical way to build up your wargames table.
Germ's World has a set of three paper vehicles in 6mm wargaming scale: drop pods, a mega drop pod and a drop ship. These would be useful for Battletech, or Reaper's CAV, or Games Workshop's Epic 40K.
Germ's World has a large collection of paper models for wargames in 6mm scale. These would be useful for, say a BattleTech game, or maybe Epic 40k. There are hangars, moon bases, factories, space docks and middle east buildings.
Miniature Wargaming is part of the "adventure games" hobby, which includes r ole p laying and board games. Wargamers recreate battles on the tabletop with toy soldiers, like a more complicated game of chess. Models range in height from 6mm to 28mm tall, with 15mm and 25mm being the most popular. There also is a growing interest in toy soldiers and military models, such as the 1/32 and 1/35 scale plastic soldiers from Conte, and Marx.
The most popular miniature wargames are fantasy and science fiction based, such as Warhammer, Warhammer 40K, Warmachine and The Lord of the Rings. World War II games such as Flames of War and Axis and Allies are new favorites. Other favorite historical periods include Napoleonics, the American Civil War, and ancients, such as Romans or Greeks. Other gamers enjoy miniature naval wargames, recreating battles like Trafalgar, Jutland and the Coral Sea.
Hobbyists research historical periods and paint their tiny soldiers in accurate uniforms. Others develop "historically realistic" rules sets or build scale battlefield terrain using model railroad techniques.
For pictures, visit the gallery.
Some of the bigger hobby companies are Games Workshop, which produces Warhammer, Wargames Foundry and Old Glory Miniatures. Wizards of the Coast produces several lines of pre-painted miniatures games, such as the Star Wars and Dungeons and Dragons miniatures games, and a historical game with pre-painted miniatures: The new Axis and Allies game. Wizkids produces a fantasy collectable miniatures game, such as the Mage Knight and Heroclick fantasy games, the science fiction games MechWarrior and Rocketmen, as well as the quasi-historical Pirates of the Spanish Main.