A meetings clock that counts UP the price of a meeting based on the the salaries of the people in the room.
http://www.amazon.com/Meeting-Cost-Calculator-Bring-Money/dp...
It was more an idea for the "snark" category though.
That said, for it to work properly, the staff would need to watching the clock too so it couldn't just be a managerial thing.
All staff would need to at least know the wage bands of each other's salaries.