My girls had to repackage hot dogs. It was really a pretty yucky job - hot dogs in large amounts are kind of disgusting. By the end, they all smelled like them and had cold hands. But they did a great job, managing to get a large bin's worth (probably 4' x 4' x 3' deep) packaged into usable amounts. I though a hot dog would be a good reminder to them of the hard work and fun - and a bit more special to them than just a food bank or community service patch!
I hadn't thought of the GS blank - usually that is reserved for a troop's own badge - I'll see if they'll let me use it. . .