Back in the days of my high school theatre costuming "career," I used to use an eight-foot-long classroom table for cutting fabrics. My back really hurt after bending over to the standard table height. I got four cinder blocks and put one under each leg: perfect height. They worked so well that I got "fancy" and covered them with fabric so the janitors wouldn't complain about scratches on the floor. When I was finished with cutting, they stacked neatly out of the way in a corner, just waiting until the next time I needed them. These served the same function as bed risers, but that was back in the days before bed risers became so popular.