Making my mark

I'm doing Kentwell's Tudor Recreation this summer. My Tudor name is going to be Thomasin or Tamsin (naath is not a Tudor appropriate name :-( ). Anyway, we are meant to mark all our personal items with our "mark" (not with name tags like school kids, and besides Tudor-me can't read or write so that's out). So I need a mark! It needs to be drawable, scratchable and sewable onto my pottery/leather/cloth/wood items and it needs to be something unique to me. Help?