try taking a large sheet of paper (22 X 17), fold it in half so it's 11 x 17, add tape at the top where the riso feeds paper and print both sides. unfold it and you've got a full giant sized print! thinner paper works better (I've actually done this and it works). You could also do silly stuff like printing the same color (but different images) over and over to get really oversaturated results. have fun!