You can change the drawing by using the slider at the bottom of the screen when you change it it may take a while to work out what it is doing but the pen will keep moving until it creates a drawing. Press 'h' to get help. Press 'w' to find out who you get help from. You can not see help because there
Only 3 drawings at the moment future updates will mean more drawings. Includes my assistant http://scratch.mit.edu/projects/25436312/