Grey Wren in dreams
A tiny, busy bird — small attention paid to the small thing that is actually moving.
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 Wren
A wren in a dream is the dictionary's image of vigilance scaled down to the size of the thing in front of you. It is the part of attention that does not need to be large to be accurate — the small, fast notice that catches what a slower eye would miss. A wren near the home is the dream pointing to a domestic detail you have stopped registering. A wren singing is the dream noting that the small, ordinary commentary on your life still has something to say.