A couple of things come to mind as I've worked with these a long time ago:
1: When they break they can have razor shape edges.
2: I think they would be extremely slippery when wet.
Both of those are not qualities that would be good for a floor.
Do as waredu says and cut them into small blackboards. Put one in your shop and your garage to make notes like when to change oil or that you need to pick up grinding discs etc. Then sell the rest on CL or Ebay.
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