Illustrator comes with a variety of preset designs that you can use in your graphs. You can also transfer the graph designs you create between documents.
To import preset graph designs, navigate to the Cool Extras/Sample Files/Graph Designs folder inside the Illustrator application folder. Then select a graph designs file, and click Open.
To import graph designs from another document, select the document, and click Open.
Initially, all that appears is a new panel with colors, gradients, and patterns from the imported file. However, the imported graph designs will be available when you open the Graph Column or Graph Marker dialog box.