Supply Hospital Sign!
I glued it to a large pretzel jug and have students but materials that are no longer 100%. This prevents students from raising their hand or getting out of their seat to show me dried out markers, broken crayons, etc.
I throw out what can't be used to anything and save that stuff that can be used otherwise (melt down old crayons, add markers to spray bottles)
Can be used in science lab or centers, or teacher lounges