Termites, in certain places, make homes that can be eight meters high and only a half meter wide. They are built facing North to South to take advantages of the suns travel, maximum heat in the morning and evening and little in the afternoon. Imagine grassy plains with vertical structions facing a certain direction all over the place. Ambush? Maze? New creature? Larger structures?
Another real world thing. White tea. Can only be picked two days a year, the two days before the flowers blossom. Could be a similiar plant that...is the deadliest poison known, cure known diseases or psychosis, or a potent herb that just tastes awesome.
Small tavern in an out of the way town. Serve a wonderful delicacy that is simply outstanding. It is a creamy white consistancy, sweet, good to eat alone or a sweetener on any dessert.
If the explore or ask they are shown where they get it. They breed a group of large catipillars or some other type of insect that basically spit the product onto a setup that they created for that particular reason. Or maybe the delicacy is the byproduct of feeding them something.
Elves use nature as strength and borrow from the trees to keep them living. An elf out of the forest for more than a day begins to die and within 3 days is dead without borrowing the strength of nature.
A race that are always born as twins and only one recieves a soul. The other is soulless therefore without pity, shame, or guilt. The evil race. Can't tell them apart by looking at them.
A flower possibly in the plains or maybe all over that is always tilted towards a certain place. Sunflowers. Could possibly follow the sun or could be forever facing a certain position because of something that happened, either the air forcing it that way and it staying, the fire was so strong that the flowers faced away from it. It could be that in one spot a large fire was made or a fire war where many fire elementals were destroyed by the True Gods and radiating out from that point all of this flower is facing away from it so no matter where you are you always know where this place is by seeing which way the flower is facing away from.
Something lives in the fog in a certain region and travels with the fog. Kidnaps or kills, or is simply heard and "felt".
In a long-lost age, a party of adventurers are frozen into stone by the stare of some gorgon-like creature. An unscrupulous rogue, coming across the frozen party several centuries later, decides to haul off two of the statues to decorate his den. Upon his death, an artisan friend of his claims a statue and sells it to a rich merchant, passing it off as his own work. Years later, the merchant gilds the statue in bronze and re-sells it at a much higher price. After passing through the art markets for many decades, the statue ends up in the hallways of a mage academy. Imagine the chaos and confusion when a young mage's spell happens to break the curse of stone, returning the adventurer to life several centuries after his petrification! Is he interrogated by historians? Driven mad by the change of times? Or does he set off on a quest to find and liberate his other frozen party-members?