Grey Pillow in dreams
Where the head rests at night — the support that holds your thinking between days.
How grey changes the reading
Grey colour layers ambiguity onto the symbol. The base meaning is still there, but the dream is saying you do not yet have the colour information — the situation has not declared itself.
The base reading of Pillow
A pillow in a dream is the dream's image of the support your mind has during the hours it is not directing itself. The pillow holds the head when nothing else does; the dream uses it as a measure of how well-supported your interior life is. A clean, ordinary pillow is the dream telling you the rest is real and recoverable. A flat, soaked, or missing pillow is the dream noting that the place your mind goes at night is no longer holding you up — sleep is not doing its work, or the support of a particular person, room, or routine has been withdrawn.