An important tool in graphic facilitation is the visual template. Typically a template is prepared before the workshop and posted at the start of the exercise. The group works on their ideas with the template in mind and with the knowledge that what they produce will be used to populate the template. This helps them stay focussed on their objective. The completed template provides a memorable record of the achievements and conclusions of the group.
This example is based on one available from the The Grove Consultants.
Further examples of workshop graphics as templates can be found in these excellent books. The key thing to remember is that anyone can prepare these - no previous artistic skills are needed.