Theming is based on the highly popular and open ThemeRoller, which is the standard for developing jQuery UI widgets. This means that you have access to 25 ready-to-use themes created by professional designers, plus a unique free web-based tool allowing you to create your own theme. You can also customize a theme starting from an existing one.

The list of currently available themes is:

• base
  
• black-tie
  
• blitzer
  
• cupertino (Apple-like UI)
  
• dark-hive
  
• dot-luv
  
• eggplant
  
• excite-bike
  
• flick
  
• hot-sneks
  
• humanity
  
• le-frog
  
• mint-choc
  
• overcast
  
• pepper-grinder
  
• redmond (Windows-like UI)
  
• smoothness
  
• south-street
  
• start
  
• sunny
  
• swanky-purse
  
• trontastic
  
• ui-darkness
  
• ui-lightness
  
• vader
  

Here is a preview of some of them
Redmond