I built a device that sits outside an office door and lets people know when the person working in the office is free or busy. When a meeting on their calendar starts, the servo motor points to 'busy.' When the meeting is over, it points back to 'free.' I used IFTTT to connect my Google Calendar to initiate the function calls.
As someone who lives from their calendar, this was a natural application of IFTTT and the servo. I also despise being remote, so I enjoyed building something for an in-person workplace. I'd love to have a more refined version of this when I go back to work next year.