As of right now, all OS 4.6+ devices only come with 1-2 themes out-of-box, usually Precision Zen and/or a carrier theme (Precision Zen theme w/ carrier wallpaper).
Older devices running OS 4.5 and below have 3-4 themes installed out-of-box (BB Dimension themes).
To get more themes on your Tour, simply choose from the many great free and premium themes available in this forum and elsewhere on the web.
to do that, all you need to do is go to the blackberry menu, scroll to the icon you want to move, click the blackberry button, click move to folder, click home