Fake campfire for camping theme! We used this when we read "Henry and Mudge and the Starry Night!" Loved it! Make the campfire using rocks, twigs, tissue paper (red, orange and yellow) and purple or orange christmas lights
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"