Re: "Motion sensors"
The company I used to work for used, ahem, moving people detectors in the loo - but again, not in the cubicles, though the timeout was long enough not to cause embarrassment.
Strangely, the loos were the only places where people-detecting lights were used; the staffing level was high enough that the lights turning themselves off was very rare. On the other hand, the rest of the building - which had large windows and was brightly lit by sunlight for much of the time - had the lights manually controlled and they were left on all day every day, even in areas that saw little use.
Once, they asked for ideas on how to enonomise. All responses were completely ignored.
Every so often, we got notes round telling us to remember to turn our PCs off when we went home at night and turn the light off in the kitchen (just an alcove off the main office area). The general reaction: "Why the hell should we?"