Try have a look at PURE.POLAR theme. It's a very minimal and simple white theme. Wallpaper friendly indeed, you may expose your own choice of wallpapers at its best.
Here's another one for you to try. It works on OS5 and is a most excellent theme, esp. considering it's free. Just about everything has been skinned to a silver/light grey/white http://forums.crackberry.com/f148/10...-icons-458533/
Here's a pic of the homescreen (using the pic you posted) & app screen.
Posted from my CrackBerry at wapforums.crackberry.com
Posted from my CrackBerry at wapforums.crackberry.com