Shredding .... maybe the local Walmart would be willing to donate a few delux shredders, and the kids could do flyers or such and set up a booth where people can bring their items for shredding ... Maybe charge $X per minute or $Y per pound of paper that will be shredded ...

I'd pay for that ... even if I had a shredder at home (which I've never gotten around to getting), it's a tedious job and if people know they can bring a bunch of labels, mail, etc. to be shredded, I bet they not only would pay, but many might even be generous in how they pay and/or tip.

On the other hand, I might be really an odd duck (I'm sure there's really no "might" about that)!