In the middle of summer a small town is beset by a blizzard that enshrouds it in a blanket of snow. The cause is unknown and all contact with the town is lost. The player characters are hired to investigate the town and put a stop to the blizzard if at all possible.
(An adventure written in the more rigid and hand holding "old school" style and quality level of original fantasy adventure modules from the early to mid 1980's)
A strange group of ghosts plague the grave yard, only seen under the light of the full moon and known to drive most men mad that hear their gibbering speech.
(A simple plug in side-quest with a twist, that is left a little generalized to fit in with any fantasy campaign with minimal prep work by a gm.)
Teenagers who run away from home to live in the wilderness may become feral. As they become more and more feral, they gain some supernatural powers (a la Peter Pan - ability to fly, things they imagine come true - possibly quite powerful), but at the expense of their humanity and ability to speak, comprehend complex subjects, etc. Maybe they have a leader: the most feral of them all.
A regression into a fantasy childlike state.