Yesterday I visited a school STEM fair. The event included teams of 10th graders who created a next-generation Mars colony model. The results were amazing. Each team consisted of various roles (e.g. CEO, business development, engineering, marketer, etc.) who were responsible for specific assets of their Mars colony proposal. Highlights included biodome models with living fish, craft-based colony prototypes with multiple levels and detailed diagrams, and various marketing materials such as websites and pamphlets for their company.
If you are looking for a resource to kick start a project like the Mars Colony STEM fair project, one resource I recommend checking out is a new design challenge hosted by MakerBot (famous for making 3D printers) called the Mars Challenge. Using a 3D design software or 2D art skills students can win awards that are based on reviews by industry designers and engineers.