At my new place of work, the elevators (well, the ones I've been in--the place is huge, so I haven't seen most of it yet) have light strips embedded in the leading edges of the doors. When they're open and it's safe to enter/exit, they show green. When the doors are getting ready to close, the strips begin blinking red. Then they turn solid red when it's "you shouldn't be standing there now" time.
I know, I know. Big deal. Well, I think it's a nice touch, and it's something I haven't seen before. :)