If it's a dreamland than anything goes.

Variable Perspective (being a room where the characters are tiny/furniture is huge)
Variable Physics (like Escher's painting Relativity)
Unseen Threats (being chased by something making horrible noises, but nothing is actually there)
Twisted Memories (This place looks exactly like the playground you used to go to where that big older kid would torment you & your friends. A tall shadow falls over the area, something is behind you...)
Random Oddness (you're in a forest area, but for some reason the birds are swaying in the breeze and the trees are singing)
Deliberate Malice (this area looks like a rocky maze, but the walls are composed of large earth elementals that get up and move around when the players get near the exit)

Go nuts.