One community service project seemed to lead to another for Michael Patterson, grown homeschooler. He shares a variety of service project ideas in here that could work for your family. And as Michael reminds us, "Kids don't have to wait to become adults to be heroes."
Make Microwavable Heating Pads - to give to every member in an assisted living home. This is community service--make it a Take Action project by a) creating a "how to" handout and giving copies to volunteer organizations that help the elderly; b) doing a community assessment to find other organizations that could use donations (faith-based orgs with a ministry for seniors, hospitals, clinics, etc) or c) creating a new group of volunteers who commit to making these year-round.