While managing a volunteer program for a social service agency, I worked with many corporate volunteer groups. Our agency had a set of standards that all of our children memorized. I created a thank you certificate with the standards written as an outside border. Thank you and the event name was in the center along with our logo. I left a big space in the middle. Throughout the event we'd capture Polaroid pictures of the volunteers doing their job. Afterwards, I'd use my circle cutter to make a hole in the center where I taped the Polaroid of the volunteer. These thank you certificates were always gratefully accepted as a special token of the event. For one particularly large event where we had the help of a very dedicated corporate team I created a photo scrapbook of their time with us. I'm an avid scrapbooker so I used fun papers, die cuts, and special lettering to tell the story of this group's involvement. It takes a little bit of time, but when you stack it up against the huge contribution of these volunteers, it's well worth it!