I've made both Mario and Boo pumpkins. (Oh, and Strong Bad, too!) The Boo one was great. My Mario one looked a lot like that one. The Boswer one was just his face. Both looked great. For reasons too frustrating and boring to mention, I don't have pictures.
Yes, there are free ones online. It takes some hunting and/or trickiness to get them, but they are there.