People argue about the true form of the beasts known as "Bloodtouches", since they seem to take dozens of forms. Unfortunately, their bite's effect isn't in doubt. Anyone bitten by the bright crimson beasts rapidly loses all hair; their skin color shifts to bloody red. Many people fear those under this curse; villages of blood-skinned outcasts huddle in the wilds.
The frozen wastes stretch for miles around. Something waddles through the snow. It's a penguin: An emperor penguin. It waddles slowly, meandering toward the sea. The ranger freezes. "Stay very still," he warns. "Don't move at all." "What is it?" I ask, breathlessly. "It's the most dangerous creature in the whole Yahoo Tundra, and that penguin's about to kick its butt..." (Sorry, Epi! I couldn't resist!)
A desolate region is almost entirely without normal vegetation. Local plants are able to unroot themselves and crawl along the ground in search of water and fertile soil. The inhabitants fence their crops in to keep them from wandering off and put heavy stone thresholds in the doorways of their huts to keep wayward plants out.
The plants sense by chemical cues, lacking sight or hearing, and tend to avoid herbivores or anything that smells of "dead plants". Characters with horses are likely to be unwelcome among the locals.
A world where, instead of aging in years, the people age in knowledge. So, instead of dying once a general age was reached, they die once they achieve a certain amount of knowledge. A man could live forever if he never learned anything, or could die after reading a few choice books. Of course, the knowledge of the land would be regulated, like medical drugs.