I've been experimenting with various BlackBerry themes lately, and this
how to article on the types of themes available to BlackBerry users--dependent on your OS version--does a good job of breaking down all the options.
I've seen threads on BBF with similar information before, but this article includes some additional info on L themes available to users with BlackBerry OS 4.3 or higher, as well as Precision themes.
It also provides a step-by-step how to on downloading themes OTA and using Desktop Manager, as well as how to find new themes.
Check it out.
AZA