There are several post about this........ use Folder organizer lite from the market it is free... download icon packs from the web from here onto sdcard and folder organizer to update old icon to new one :
http://browse.deviantart.com/customi...er=9&offset=96
this is one site, there are many more.. Use the search function in this forum.
Folder Organizer also allows you to remove text underneath icons.