Stamp carving can be done on a variety of materials (erasers, rubber block, etc.) with a variety of tools (razor, x-acto knife, carving tools, roto-tool, etc.) I started carving stamps with an x-acto knife on white mars erasers. Later ones have been on carving block with carving tools. I hope to try roto-tool someday, too! These are all from my own designs.
Here are the stamps I have carved, in order of completion.