To the bemusement of passers-by, I use my employer-provided 23" Samsung display as a physical board for 2" by 2" Post-it notes. They really stand out on the black background.
I did the same at a previous job where desks came with monitors as standard. I tried to use it, but always ended up ignoring it and going back to my laptop's screen. Eventually I repurposed it as a board for post-its.