Most of the table toppers I have seen are in books. This is where all the free Bargello patterns I know are. You might scroll down to the Hoffman free pattern near the bottom of the page.
http://quiltinspiration.blogspot.com...lo-quilts.html
You can also search on Ebay to see if there is a pattern from a magizine:
http://www.ebay.com/sch/Quilt-Patter...gello+patterns
If you are looking for something like this pattern, it is Twist-and-turn Bargello Quilts by Eileen Wright.