Just needed to look down further in this forum for a thread that may have some answers:
http://www.blackberryforums.com/medi...con-theme.html
As an aside, I'm not sure if your build of 5.0 is too new to use the theme I made and posted in that thread. If it behaves like the newer builds on my 9700, you'll end up with wallpaper you can't change. Otherwise, another member posted an option as well in there that would for sure work for you.