I'm still using a theme I DL'd in January for free called Section8
http://crackberry.com/blackberry-the...uary-18th-2010
It's free and it allows you to have 11 applications accessible on your homescreen while still being able to see your wallpaper. Also, most of the settings on the phone are accessible on the mainscreen by clicking on thngs like the time, the network status indicator, the charge level, etc.
It's professional looking and works great if you don't like having to go into the big slew of icons you get when you press the BB button.