The iPhone 4 theme for your BlackBerry device isn't just a theme, it's more than that. The iPhone 4 theme is a "simulation of the iPhone, ported to your BlackBerry device." The theme especially takes on iPhone-like qualities when installed on one of RIM's touch screen devices such as the Storm or Torch. The theme is, of course, also available for non-touch devices with OS 5.0 or higher.
The iPhone 4 theme is available for only $3.99 in the store!