You can customize virtually every aspect of the Look and Feel of your survey. Customization options are under:

• Login »  My Surveys »  (Select Survey) »  Survey Options »  Display Options

Here is a sample list of options that you can customize :-

• You can select from the predefined style-sheet templates or "Customize" the them which gives you unlimited color and style options.
  Customize Theme (CSS) option is available only with Corporate and above licenses.
• Customize the navigation buttons (Internationalization (I18n) Supported for Multilingual Characters).
• Specify the location of the Progress Bar or completely remove it.
• Set whether to display the Validation Message or not.
• Specify the Language for the Survey.