If you want to have a unique presentation without paying a vast amount of money, then you can download a premium theme from a theme seller.
Market Share is a commercial theme for Ubercart. It offers 16 Drupal regions and includes stock photos, logo, and layered Photoshop file. It also has a drop-down menu and custom Add to cart buttons.
Top Notch Themes
This theme has a fixed layout width of 900 px and provides one- or two-column layouts and 15 block regions. It includes custom theming for the most important elements of Ubercart, such as product pages, attributes, ...