John if you have captured the content that you hoped to capture, then you can keep or discard the artwork etc. If something is excellent and you have digitally, you can use in publications or presentations. If it is something that warrants posting, maybe create an art wall or another presentation with some of the materials. Let you imagination go wild. Ask your participants. I hope that this is getting us closer to your question.
John it depends on the purpose of your session. Once you harvest the ideas generated in the cafe, there are a variety of things that you can do. If it is strategic planning, move into a process to prioritize and define the opportunities. If used for a focus group, use to provide feedback. If generative use to decide the next step in the community. If used for healing, go on into the next phase of your process using what you have harvested. One way or another, further conversation around what you have co-generated will be important.