Yeah, the front page looks great. With the complexity of the scribble designs listed, going with a lightweight page makes them stand out, and works well.
Or, do you think secondary pages aren't necessary--that they would just be one more click people would have to make before being able to buy? My main concern is that its hard to see the detail of the artowrk without having a larger picture that people can view.
Adding additional click through pages would be tough, without complicating the order/selection process. If you were to try and make something workable, you would probably be circumventing the cafepress layout so much, that it wouldn't be worthwhile to use cafepress at that point.