Here’s a tip from a member of the BlackBerry theme building community: RIM will be releasing a new version of Theme Studio sometime this early summer giving theme developers lots more options when creating BlackBerry 7 themes.
Until then some of the more industrious theme designers are still churning out BlackBerry 7-compatible themes by reverse engineering the stock BlackBerry 7 theme. I’m told it takes a lot more time than having the official theme suite doing the legwork for you, but the results are just as stylish and fuctional.
Check out the HDV theme by HedoneDesign for instance, this iOS replica theme will style your BlackBerry 7 device as if it were iOS-compatible. This theme is optimized for BlackBerry 7 and promises not to drain your battery any faster than the stock theme.