Views Slideshow comes with very minimalist theming out of the box, but there are various tutorials that address slideshow theming.

• 18.1 Overview
• 18.2 Drupal themes
• 18.3 Approaches to site theming
  • 18.3.1 Using an existing theme
    • 18.3.1.1 Identifying requirements for your theme
    • 18.3.1.2 Researching and testing existing themes
  • 18.3.2 Modifying or configuring an existing theme
  • 18.3.3 Developing a highly customized theme
• 18.4 Installing and enabling themes and subthemes
  • 18.4.1 Installing themes
  • 18.4.2 Enabling themes and administration themes
  • 18.4.3 Configuring global settings