Using whatever materials can be thought of and scrounged up, have students construct a model of a rocket. The model need not be exact nor even resemble an existing rocket. It need only have some resemblance to rockets. Make it out of whatever is available and as tall or as big or as tiny or short as the student's imagination. Paint it silver or white like conventional rockets or a rainbow of colors quite unlike anything NASA has seen.
Originality is the key here.
Some basic ideas to get started are attached. Discuss what these things are and encourage students to look at many pictures of rockets and to discover the names of some of the other parts they see on rockets.