This is some seriously cool shit. This guy uses an android phone, old Gameboy casing, and the internals of a Wii remote(bluetooth connectivity w/phone) to build a cool gameboy.
http://www.nintendolife.com/news/2013/01/hacker_combines_game_boy_wii_remote_and_android_to_create_portable_nirvana
http://www.nintendolife.com/news/2013/01/hacker_combines_game_boy_wii_remote_and_android_to_create_portable_nirvana