If you're looking for a way to spotlight volunteering in your unit, consider creating your own motivational poster starring your volunteers! You can create your own inspirational posters here: http://bighugelabs.com/
Choose the "Motivator" and then upload your photo. Use a famous quote about serving or volunteering, and change the colors to reflect your group's logo or dominant colors. Then, save the file, and upload it to Snapfish, Shutterfly, or any other photo sharing/ printing company that you use. Have a poster created for about $15 that is completely consistent with your group and gives the perfect message for your volunteers. This type of poster, mini poster, or 8x10 photo would be great on a volunteer bulletin board! Or use these photos to create photos, cards, mugs or other items to present to volunteers.
It's a great way to complement other posters that you may already have that promote volunteering or to use as a stand alone poster to show your volunteers that you truly appreciate and value their work.