Denizens of the Dreamlands/Fey Realm
by HåvardBaldandar
Brownie
Centaur
Chevall
Coin-Sith
Crone of Chaos
Decapus
Dryad
Elven Horse
Faedorne
Faun
Flitterling
Fungoid
Gakkarak
Hag, Black
Hag, Sea
Lake-Monster
Leprechaun
Nixie
Pixie
Pocket Dragon
Pooka
Shagurgh
Sidhe
Sprite
Treant
Woodimp
Wych Glow
Yowler
Above is a list of creatures from BECMI and the creature catalogues that seem like they would feel at home on the Fey Plane (Dreamlands). In addition, all plantlife and animals probably exist there.
What do you think? Are there other creatures missing that should be on this list? 4E's Feywild also made Dinosaurs at home on the Fey Plane. How about Giants?