The Jam theme for BlackBerry is built around a unique and well-designed icon set. The great part about this theme is the style of the icons: highly graphical and simple icons done entirely in greyscale: Beautiful.
Jam is designed with personalization in mind because users assign their own wallpaper or wallpaper changer. All too often themes are designed and based on custom background wallpapers. With Jam, icons and good fonts come first while UI retains it’s BlackBerry familiarity.