A Potted Plant
Honorary Sod
Our unwritten but accepted policy is that if you are on call on a holiday then you don't have to work outside of responding to a critical page, and then you get to take another day off. It's basically a twofer, since almost nothing happens on a holiday.
I'm not on call, just didn't want to burn time for a do nothing day, I'll do house stuff for 8 hours paid and keep it moving