Eraser stamp materials : eraser, ink
Eraser stamp tools: cutter knife, stamp holder (not a must )
Step1 : Get an eraser you want to cut into stamp. I found this eraser I bought years ago.
Step 2 : Draw whatever you want on one side of the eraser. Put the eraser on a stamp holder. The stamp holder is not necessary. You can just hold the eraser in your hand. Take care, not to cut your fingers!
Step 3 : Start to cut the eraser off.
Step 4 : Try the stamp and see where to refine.
Step 5 : After refining, a clover eraser stamp is done.