I tried to get the Zazzle store builder working in an Artisteer generated template before but I couldn't find a way to make them work together. I downloaded the latest version of Artisteer and redid the template with the new features. Now the two blend together very well.
The Zazzle Store builder is flexible. You can narrow the width to fit the content block and change the size of the cells. Other options include adding or removing title, description and price. The comments are a big help too.
The Postcards page now includes better navigation and updates. I'll be using the same template for the Notecards page