My favorite petunia this year is the NEW "Pretty Much Picasso Petunia". I really like the combination of the purple and green flower; a hardy plant, can climb on trellis or spill over a container. I decided to grow mine in a container that sits on top of a stand.
Here's a website to learn more about this beautiful flower: http://www.provenwinners.com/plants/detail.cfm?photoID=9320