Conceptually, Element Case's Vapor for iPhone 4 ($80-$100) might strike some people as a good idea, and this machined aluminum version of Apple's Bumper case is indeed attractive: it adds an additional metal frame to the outer edge of the iPhone 4, initially in either an all-black color scheme or in black and pink -- red, yellow, and silver variations are planned for future release. (The samples shown here are all gunmetal and black/orange versions…
