I like this as a way of displaying family pictures too! If you still wanted to do the traditional family tree, you could always use this idea for displaying pictures taken in the classroom and pictures with friends - their "classroom family"
4 Candle Centerpiece Planter Display Tray Illuminate your dinning table while displaying your succulents. Handmade from recycled pine, this versatile piece serves as a candle holder and planter. Fill it with rocks, moss, plants, wine corks and more.