The ideas that I am submitting has been submitted in the past but was withdrawn with the release of some near-hit styling options that met the need, sort of (see link below). In my opinion it would be very useful to add a feature that would let you see, at a glance, which tiles have recently changed; either in the form of a short-lived pulse of the tile or a dark-to-normal color fade over n seconds.
It was said in the previous idea that people are not vigilantly watching their dashboards for updates. Although true I feel that an increasing amount of people will increasingly begin relying on dashboards for security and presence monitoring. I can think of many situations where this could be useful for events of both low and high priority. There is a current option to use different colors based on intentions, this would get closer to satisfying the this idea's feature-request if it had a time restriction on when the "warn" color is to be used. Example - for most of the day I would like my garage's presence sensor to just show me if it is occupied (low priority), but after 10pm if when I am back home it would be a problem if presence was detected (high priority). Having a dashboard with 30+ tiles I may not see at first glance that a room was just occupied when it should not be.
At night when I am in my office I do monitor outside motion and indoor presence, some would say vigilantly - while concentrating on my work with with my device visible out of the corner of my eye, I notice somethings has changed but takes a bit to figure out what did change and if it matters. A temporary pulsing or darker-shaded tile would allow to me to look over and then back to my screen without breaking my thoughts or typing rhythm.
Previous idea that was withdrawn:
Customer support service by UserEcho