I think that a lesson about designing an alien being would not only engage students creativity but also allow them to think about life beyond the Earth and the geography and science of different planets and moons. After discussing the possibility of life in space and how that might look we can discuss the variety of life on earth and how animals are adapted to live in a variety of environments eg deserts and the poles. Working in groups the children will research the landscape and atmosphere of various planets and moons and design an alien which could survive in that environment. Their alien might be adapted to live in very hot/cold temperatures, low-gravity, high-pressure, toxic, dusty environments etc. After sketching their alien they could create it using clay and paint, give it a name and introduce it to their classmates. The activity could be extended into a writing class where the children write a story or poem incorporating their alien.