When I originally set up the site, I knew I wanted to include a link to Gleaners food bank, a charity in my area. I thought a good way to get people to see the link would be to place it in a free graphics section, and attach it to every free graphic there. It felt like a food based charity would be a natural match for a food based graphics site. I decided to go with free vegetables because the main collection is based on sweets. This way I can offer free images, but not get them too entangled with the graphics I have up for sale.
I'm interested in seeing if it helps with traffic to the site. Even if someone doesn't buy because of it, maybe they'll give a donations to Gleaners at some point, which would make the free section worth it too.