Wyrmworld has a well-thought out and complete set of rules for using dragons in Games Workshop’s Lord of the Rings Strategy Battle game.
Soulsteader is a Heroquest variant that
that can be played with any number of people. This game allows the process of building the landscape to be an intrinsic part of gameplay, and not merely a task performed prior to battle. It is intended as a better way to play HeroScape, one which makes every aspect of the product part of the gameplay itself.
The game centers around tile constructions called Wellsprings, control o
Dungeoneering dot Net has a nice selection of printable terrain tiles ostensibly for use with the Dungeons and Dragons miniatures game, but which would also work with any number of dungeon crawl games — of which there are many free ones available on this site.
Quests of Heroscape adds a new element to the basic Heroscape game. In it, a victory is achieved by completing a series of random quests. The rules include some professionally done quest cards.
The Last Alliance has an article on making Mallorn Trees — those huge trees amongst which the elves live in The Lord of The Rings. The idea is that the trees are so large — and their branches so high that only the trunks come into play in a game.
Now, I don’t have much use for Mallorn Trees, but it occurs to me that the same technique also could be used to make the trunks of trees in, say, the Brazilian rain forest. You could use some of those Copplestone pygmies and Amazon explorers.