Earlier this year, we checked out Material World, a book of family profiles from around the world. Each family has a short interview, some stats, and a photo where they moved every belonging in their household outside. There's a stark contrast between many cultures and not just between Americans and the poorest countries.
Peter Menzel has a newer book out, Hungry Planet: What the World Eats, that shows each family's weekly food intake. Time has a number of the photos on their site. I like how the Beijing family has KFC.
Menzel's books make an excellent addition to fill out general social studies in a homeschool curriculum or just to enhance your kid's education. We also have DK's A Life Like Mine, which shows how children live around the world.