I'm a flooring contractor, so I have a lot of carpet samples lying around. Each sample is big enough to stand on, and has finished edges so it won't unravel. I keep a couple of them in the truck for riders in our group to stand on while changing into riding gear. It keeps you from burning or freezing your toes and dirtying your socks. You should be able to pick one up cheap at a home supply store. Or check with carpet outlets. They may have discontinued styles they no longer need.