EFFECT: Spectators create their own drawing from a sketch pad containing several dozen segments of artwork. When the performer's prediction is removed from an envelope, he has correctly guessed which combination of artwork the spectators would select!
Sketch-O-Magic I uses the picture of a boy with a beanie for the prediction and II uses a picture of a boy with a "robin hood" type cap, perfect if you'd like to repeat the trick later in your show.