Occasionally, a bird swivels so that its lighter-colored underbelly shows, lending tonal range to the work while also making sure the audience reads these as mynahs and not, say, crows.
If Metro can be criticized for anything, it is that it is so mobile-centric that the large screen expression in Windows 8 becomes a crazy quilt of pulsing colored boxes.
Colored squares on the data tags for airplanes on the controller's radar screen change as pilots respond so that controllers get an extra visual cue in case a pilot doesn't see a message.