http://sketchup.google.com/3dwarehouse

Warehouse of 3D objects for Google Sketchup. Objects include buildings, vehicles, furniture and much more, allowing students to create their own works of 3D art and design. This can be used in traditional design and technology subjects, or, with a little imagination, in subjects such as English. For example, ask students to create a scene, in which they then set a story of their own writing.