The biblical metaphor is that Christians are bricks being mortared together into a building with Christ as the cornerstone. As we say at our church, “God makes bricks with a building in mind.” (You can read more on Pastor Chris’s blog).
At our church we have many illustrations of what it means for bricks to be mortared together into each others lives. Recently, one of our church family was injured and was unable to complete repairs on his garage. So representatives from our church family (and others as well!) enjoyed themselves while finishing the project.