How I show theme selection page with thumbnails to everyone? I want to create a menu link for theme selection to users (also for anonymous users). I have installed the Switchtheme module but it shows only theme names; my requirements are to show the theme name with thumbnails, just like we see in "User account -> edit -> theme configuration" or with normal theme selection in admin/build/themes. So how can I do this?
Go to permissions page sitename.com/admin/user/permissions

search for switch theme and apply for roles. 

Switchtheme Also provides some Blocks see Block configuration page 

Thats all.