Grey Notebook in dreams
A bound book of blank pages — private space reserved for your own thinking.
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 Notebook
A notebook in a dream is the dream's image of a private container for thought. The notebook does not perform; it holds what you have not yet said aloud. The dream brings the notebook when there is interior material in your life that needs a place to be written down before it is acted on. An open notebook with fresh entries is the dream telling you that the practice of recording your own thinking is, currently, doing its work. A lost or filled notebook with no replacement is the dream noting that the private container you used to use is no longer available, and your thinking has been left without a home.