This is a course I designed as a grad student as a part of a teaching certificate program. I hope  to teach a version of it some day.  The syllabus and description of the final project are downloadable: 

I have collected some images that illustrate the subject on a pinterest board that can be found here.  I was thinking it would be a fun first class assignment to have everyone find an thought-provoking geobio image, write a caption for it, and post it to the board.  After spending some time looking at the class board, students would engage in an introductory discussion about what geobiology is and why they are taking the course.