Take ideas from what you know about each memory piece then form activities around them. Some of my memory pieces draw so alot of my activities involve drawing. Some like crafts like making things out of card board and shoe boxes so some of my activities involves that. Some of my memory pieces enjoy cooking so some of my activities revolves around cooking, Some of my memory pieces write so some of my activities are writing, some like biking and walking so I have activities scheduled around that too. any activity can be make into an activity for DID therapy. I think my blog explains some of them. The book Amonst Ourselves by Dr Tracy Alderman and Karen Marshall is also a great starting point for activities.