Anyone do a belly cast?

So our photographer (absolutely amazing at newborns and toddlers) wants to expand.

She asked after our maternity pics if we would be her models for a few things she wants to start doing so she would use us and then have examples....

She wants to fo a belly cast and take some newborn pictures of baby in it after. What have you then done with your cast???? Would love ideas of what to do with it when we are done

She also will be doing labor & delivery pics and fresh 48 pics :-)