This is a project I used with my classes that turned out well. It had students compare the functions of the parts of a cell with things in a city. They could choose whatever setting they liked. I had things like Spongebob, Harry Potter, and even World War 2. I'll post some pictures of finished products on my blog. Included is the project information sheet, student planning page and grading rubric. It's a Word document so that changes can be made.