For older BlackBerry devices, themes ruled all. They could completely change how your device worked. After RIM released BlackBerry OS 6, however, the need for themes quieted. They had finally gotten a workable interface. Yet many BlackBerry users are still using older operating systems that benefit from themes. Still others want to take advantage of new theme developments for BlackBerry OS versions 6 and 7. We’ve reviewed dozens, if not hundreds of BlackBerry themes. Here are our picks.