These plates can be rubbed in much the same way as gravestones. Westminster Abbey in London, England , has a place where visitors can make rubbings from some of their carved items, or buy kits to make their own at home. However, it's not that hard to find things around the house that make interesting rubbing pictures. Try an old key or two that may be lying around. Or go outside and pick up some leaves from trees in the yard.
Many natural materials make really nice rubbings.
Just get the object you want to use and put it on a hard surface, like a table or a countertop. Go back and forth, covering the area where the object is lying under the paper. And here is an example of what happens if the object moves around or if the paper isn't taped down . You can make one rubbing, then lift the paper, move the object a bit, and tape the paper down again and make another. If you do this several times, you may get a result like this one.