Grey Swallow flock in dreams
A turning cloud of small birds — collective movement that looks like a single mind.
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 Swallow flock
A flock of swallows in a dream is the dream's image of group movement so fast it stops looking like a group. Swallows turn together; the flock behaves like one body. The dream brings them when something in your life — a mood, an opinion, a wave of action — is moving through people as if it were a single thought. A flock you are inside is the dream noting that you have stopped tracking which decisions are yours and which are the group's. A flock you are watching from below is the dream saying you are still your own bird, and the rest is weather.