The Sid Lee agency in Paris has Arduino-powered sensors hooked up throughout their office, and they brought the data together in a single dashboard. The result is a fun look into the inner workings of the agency in real-time.
They're counting toilet flushes, stairs walked, water consumed from the cooler, doors currently open, and so much more. Click on the plus sign in the top right corner of any panel to see the counts over time.
See video below for more on the sweet hookups.
Something like this is on my to-do list. Moving it up in priority.