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I think it's probably okay as long as it's non-toxic and not harmful to the environment. Maybe try terracotta or another type of real clay (as opposed to Crayola or something like that) that's found in nature. You can usually just buy a nice big chunk of it in art stores. In my experience, I've found that using twigs and bark and other natural resources seems to be more well recieved but really it's up to you. Intention is what counts in the end =)