I have had the feather thing happen after a dream.
I rose and rose and rose so high that I became afraid, it wasnt really a dream, I was very concious. Then there where feathers floating all around me in the bluest sky. I felt in awe.
With out going into all the details of the dream, the next day as I'm sitting in my office white feathers are falling down in front the window, I peer out to see were they are coming from and there are two dove sitting on a wire outside the window. I'm thinking coincidence...right. Well next day my daughter and I are sitting in the glass door talking and day dreaming and there floats a tiny white feather... I told her to lets go out and get it - when we got up to go outside it took off in the wind. A couple of days later again, I'm in my office and tiny white feather floats down from the tree, this time no birds (just like with my daughter).
I'm not sure if angels have feathers, I'm not sure if birds are messengers of the divine, but I'm sure the feathers which followed my dream, were significant.