I think an Influences workshop might be interesting. None of us were made out of whole cloth. Each participant could do two or three songs they either learned from someone who greatly influenced their style (I have several) or songs done reflecting the style of a musical influence.

I did a workshop at NOMAD a few years ago that might be interesting, too :A Family Album of Songs. The songs could include not only songs written about family members, but songs that were particular favorites of a family member.

Jerry