If a white feather is a sign that an angel has visited, what about other coloured feathers?

Whenever i see a white feather i am reminded that angelic presences are with us,
whether to keep us safe, cheer us up or remind us of our purpose.
So what does it mean to see feathers tipped with irridescence,
shimmering in the sunlight,
changing from turquoise to deepest blue to green and back to turquoise?
Perhaps that the angel has left behind some of her aura
the blues to remind us to slow down,
to take time to give and receive healing;
the greens to remind us to trust and listen to our innermost feelings,
to seek the restorative power of Nature...