Since many graphic designers are also Web developers, consider adding services such as repurposing print design to Web page layouts that incorporate data collection. This sets the stage for real-time data streams that can be utilized for ongoing response output.
A simplistic example would be that you could offer an integrated life-cycle model. A generic mailing list is used for a postcard mailing that directs recipients to a Web site. Interested prospects then fill out a Webform questionnaire. Once submitted, the data is automatically filtered into a VDP database and a customized printed response is generated. From there, the same cycle can repeat itself in future communication thus enhancing the "it's all about me" personalization phenomena.