The California Institute of Technology is making a little green off the red planet. Caltech, which runs the Jet Propulsion Laboratory for NASA, patented the twin rovers it sent to investigate the surface of Mars and is licensing their images for commercial use. Models of the six-wheeled Spirit rover are already on store shelves. Caltech has inked three deals so far and expects perhaps three more. Officials of the private university didn’t say how much money they hope to make, but pledged to donate half to educational outreach programs and the rest for Caltech research.