I would enjoy if it rotated a bit through different creative reminders.
"have you exercised 150 minutes this week?" (low activity has been purported to kill as many people as smoking, and a bet a lot of we computer users are in that demographic.
"Any hobbies interesting you at the moment? Why not work on them for a bit?"
"Get back to work!"
"Go get out of your comfort zone"
And maybe some inspirational quotes.
Thanks for thinking about it!