Lay a mirror down, take a hammer to it, pour polyurethane over - Amazing bathroom floor - or could do for a desk top. or coffee table.WALKING ON BROKEN GLASS I would have this for a desk top instead of the floor.
River rock in between wood and tile floors. Good idea to transition between family room with stained concrete to kitchen with slate or granite. Also possibly between kitchen/"dining area" and living room/rest of house where I want wood floors